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Perception, Logic, and LanguageSubmitted by NickOtani on Thu, 2007-08-23 06:35.
Everybody begins life as a naive realist. We believe what we perceive. We progress through developmental stages inwhich our cognitive abilities and corresponding perceptual skills take on some sophistication. (Piaget) At some point in our lives, we become convinced that objects exist independent of our perception of them - that is, our cars do not stop existing simply because they are locked away in our garages. Also, we come to suspect, at some point in our lives, that objects exist independent of our wishes and beliefs - that is, we cannot make our cars go away simply because that is what we want. Even with the strongest of beliefs, we cannot wish our cars into teacups. Generally, we believe that reality is objectively discovered and not subject to our wishes or beliefs. The problem is that we do not and cannot discover everything. Our perceptual abilities seem limited. It is only through the assistance of technological facilities that we can detect certain sounds heard by dogs or see with the sharpness of an eagle. Without devices such as the radio, we cannot tune in on the sound waves which are almost always around us. Even the things we do perceive may not be perceived correctly. Our senses sometimes fool us. We sometimes see illusions, like a bent pencil in a half a glass of water. Also, if our senses were somehow differently constructed; if, for example, we had eyes like those of a bee, then we would either perceive reality differently or perceive a different reality. The reality we see differs, to some extent, in the eye of each beholder. This is because there are times when we adjust our perceptions by taking mental leaps. Nobody has ever seen a perfectly square box, yet we still attribute squareness to certain objects. We ignore the slight imperfections of an otherwise square object. We ignore a small blemish on an otherwise pretty face. (Unless we don't like the person. Then the blemish becomes larger.) We fill in our incomplete picture of reality with our own details. More than this, we sometimes impose our ideas onto that which surrounds us. We cannot discover everything, therefore we create certain things. It may be that the problems with perception are insurmountable, and we actually create everything. The law of gravity did not exist until someone made a mental leap. The laws of logic and the laws of physics may be nothing more than the figments of someone's imagination. It sometimes seems that all scientific explanations are only the most current mythologies that we use. They may be no more real than the ghosts and gods that we once thought were real. Thousands of years from now, if we don't go through another dark ages, people may view our most sophisticated observations as we view Thor and Zeus. Is there one reality which each of us perceives differently, or is there a different reality for each of us? Is there an objective reality which we can, to some extent, discover; or is reality entirely subjective? Are we even on the right track? Perhaps we are presumptious in thinking that we are even capable of discovering or creating anything. Perhaps it is reality which forces itself upon us. Plato said that the light of reason shines on eternal forms or ideas and casts shadows which are the appearances and approximations of our imperfect and unreal world. Although Aristotle tried to explain things differently, the difference between Plato and Aristotle is only semantics. Both posited two realities, one of form and one of matter. Bishop Berkeley said reality is only a mental thing, except that we are all in God's mind. However, without the assumption of the independent existence of matter, there could be no proof for the existence of the mind. Where did all the mental images come from? Berkeley may have said mind was over matter, but "No matter, never mind." What a great quote! Most of us are willing to accept the assumption that there is something out there, and we label and categorize it as we come upon it. We put meaning into the world, but the world also forces us to recognize it. The world exists in our light, but without any world, there would be no us. I would like to think some objective knowledge is possible, and I would like to make the pursuit of that knowledge my goal. I know that I must take certain leaps of faith, but I want only to use them as temporary assumptions in a continuous search for undeniable facts. I must be able to discard my beliefs in exchange for truth. Even when the "real" world is discomforting to me, I must prefer it to the security of an imaginary playground. I may ignore the small imperfections on an otherwise square box or the blemish on an otherwise pretty face, but I cannot ignore blatant injustice or that which is of potential danger. I cannot pretend harmful elements do not exist. I cannot project only pleasant things onto the world. As paradoxical as it may sound, I want to learn more than simply that which I want to learn. The method I use to find objective knowledge is observation and generalization. I observe that which surrounds me, and I generalize things based on those observations. My generalizations then become something else that I can observe, and I can make further generalizations. I can observe something which calls itself Aimee, and I can generalize that Aimee is a woman. Further, I can generalize that all women are human being and all humans are living entities. The further I get from the specific person, Aimee, the more abstract I become. Even when I observe the method I am using to generalize about the method I am using, I must conclude that my conclusions are a product of this method. (S.I. Hayakawa, Language in Thought and Action, 1963) Unfortunately, all generalizations based upon observations are not objective facts. False conclusions could be due to insufficient evidence or faulty reasoning from the evidence. Even the most carefully formulated generalizations can be false. If a thousand Abadabs are Bugaboos, it does not necessarily follow that all Abadabs are Bugaboos. It is this inconclusiveness of all inductive reasoning which prompted David Hume to say that knowledge is only an illusion to be maintained by the ignorant. However, even Hume's statement is a product of this inductive method. In a strict sense, there is no way to assert absolute skepticism which does not desolve into an ultimate paradox. Our classification system could be wrong, but it can be adjusted in the same way it was created, through the inductive process of observation and generalization. As a tool for moving from observation to generalization, logic has several inadequacies. In more ways than one, logic has limitations. If it is used as a crutch or security blanket upon which people become dependent, then logic can stifle rather than facilitate growth and development. There is too much faith and opinion stuck in with logic. The primative basis upon which rules of inference can operate cannot be arrived at through the same rules of inference. Everything leads back to certain assumptions which are generally accepted or arbitrarily chosen. These assumptions are not necessarily objective facts, and conclusions drawn from them need not be undeniable. Also, when the system emerges, there must be another system against which the first system can be verified. Godel's second theorem states that if N is consistent, then the consistency of N cannot be proved by methods formalizable in N. If there must be more than one system, then which system determines which system determines truth? It seems logical, then, that logic may not always be logical. We already know that inductive arguments are always inconclusive. Deductive arguments are always circular. It would seem, then, that all propositions of logical truth are merely sophisticated pronouncements of faith, and the only two positions open to philosophers are dogmatism and nihilism. When people in the real world, even people on this board, say something is not logical, they often mean they do not understand it or do not like it. It is often the force of personality which wins debates. It does not matter what is logical or right. How many times have we sat at meetings knowing our points were inescapable, logical conclusions; but other people only ignore what they don't want to hear. It seems that learning about logic is not worth the educational effort. Oh, I feel bad, but wait! If you stick with me, I'll still show you some value in logic: At this moment I am picking out certain symbols which a certain group of people decided to use to refer to certain objects and ideas. I am, further, interchanging these symbols into two-part substitution frames of subject-predicate. This seems to organize my symbols in such a way that they show some relation to each other. As a consequence, the reference capacity of my symbols is expanded. Each of my statements is an attempt to communicate meaning which cannot be expressed by random, unstructured scribbles. I use this process not only to explain my ideas to other people but also to examine ideas for myself. The process of communicating with one's self is an important form of thinking. This ability may be the only thing which separates human beings (Perhaps also chimpanzees, dolphins, and an African Gray Parrot) from other living creatures. Our observations indicate that most animals and insects do not seem to consciously employ a structured form of symbol manipulation or loose "system of logic" for communication. Ants, bees, and other social insects have a very intricate communication system, but it does not seem that they are in conscious control of it. Most animals can make meaningful sounds, but no structure can be detected. It could be that Suzan Langer was right when she said that the power of using symbols is the only thing that makes man lord of the earth. (The Lord of Creation, 1944) According to Benjamin Lee Whorf, it is through our language that we analyze nature, channel our reasoning, and build the house of our consciousness. (Language, Thought, and Reality, 1956) This implies that our language not only facilitates but also limits our awareness. The good thing about our language is that it allows us to conceptualize rather than depend on percepts and sensations as do other living things. It is because of our language that we can grasp the gestalt of our experiences. We can formulate cognitive maps which guide us where our inherent reflexes and automatic functions cannot. Without language, we could not make many of our generalizations from our observations. However, we are also limited by the limitations and structure of our language. Just like formal logic, language ultimately rests on social conventions. How can I depend on something which is the result of that which was haphazardly chosen by the group of people of whom I happen to be part? There are different languages with different structures which may very well shed a different light on my ideas. How do I know that the pattern of my language is the most reliable and accurate guide for showing the relation of my words to each other? The true rationalist would maintain that there are certain principles of thought which go beyond mere convention. The law of identity and the law of non-contradiction are conventions based on underlying facts of reality. It does not matter what the convention is; it must always be true that A is A and not not-A. However, the rationalist can only assert this. He cannot prove that general truths are true. He must still assume that there is an order in nature, and reality is not beyond rational comprehension. Even if we could base logic on underlying, objective facts of reality, there would still arise several problems. For example, Epimenides' paradox (The statement "I am lying." seems both true and false.), and Russel's construction (The statement immediately following this statement is false - The statement immediately preceding this statement is true.) are only a few of the brain teasers that still make logicians feel insecure. Logic does not seem infallible as a criterian for truth, but other criteria are also not without problems. When two opposing views rest only on faith, then settlement cannot be easy. Majority rule, intuition, authority, revelation, etc. all can be wrong. Even pragmatism has only the appearance of truth. At least logic is self-critical and self-correcting. It points to its own inadequacies. The other ways of arriving at truth do not have this safeguard. Perhaps an enlightened rationalism is still worthy of cultivation. It may even be good that logic is not perfect. If there were no problems with logic, then the idea of freedom would be somewhat threatened. We could still say that one can choose not to be rational, but what is not rational about choosing to avoid a prison? Why should one choose to be rational if being rational locks one into a single course and prohibits creativity and surprise? If logic were perfect in every way, then a rational life would probably be a little dull. I think logic can often be a useful tool. We should use logic, but like drugs and alcohol, it must be used with caution. We should not allow logic to use us. bis bald, Nick
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Real funny, Jameson
If you can't answer questions, support accusations, and debate; ridicule your opponent. Nice use of reason and logic. Rand would be proud.
bis bald,
Nick
Sorry - fixed the spelling mistake...
Where do I defy logic?
It's not really defying logic to act in places where reason and logic don't reach.
bis bald,
Nick
Okay, I apologize.
I could not find where you said, "Reason reaches everywhere." Perhaps I got confused between what you said and what Jameson said about logic. Nevertheless, you seemed to be arguing with me that reason does not reach everywhere. That is my contention, and I demonstrated it. You seem not to want to recognize this, even when I emphasize it as I did.
Do you think reason reaches everywhere? When I make a baseless choice, am I using reason and logic? Is there a way to use reason and logic before we have knowledge of the possible consequences of an action? Please answer these questions.
I am not trying to be difficult. I am trying to make my points. I sincerely think I am right. You may disagree with me. If I were to prove my points, against your views, with reason and logic, would you admit it?
bis bald,
Nick
Parting Shot
I have not said 'reason
I have not said 'reason reaches everywhere'. I don't even know what that means in the context that you are using it in. Reason is the tool I use to gain knowledge about reality. It reaches everywhere I can reach ie. up to the ability of my mind.
Pride? Truth? What pride can one find in un-truth? What truth can one find outside of reason?
Wm
This is not a game.
It's a debate. You made the claim that reason reaches everywhere, and we found a place where it doesn't reach. You are too dishonest to admit that you lost this point.
You seem more interested in pride than truth. This is more of your willfull ignorance.
bis bald,
Nick
He wasn't asking you to prove reason
You can not prove reason, since reason is the method of proof. But you can validate it. Check out OPAR or IOTE from the SOLO store.
He was asking you to prove that reason reaches everywhere. We found a place where it doesn't reach, so you won't be able to prove this claim.
bis bald,
Nick
Keeping score?
This is not a game.
Wm
It's a baseless choice
We won't know until later if it is the best choice. We just choose. We don't weigh consequences and use reason. We just choose. Be honest. I won this point.
bis bald,
Nick
Prove reason
You can not prove reason, since reason is the method of proof. But you can validate it. Check out OPAR or IOTE from the SOLO store.
Wm
Glenn - Imagination is a
Glenn -
Imagination is a different type of thinking than logic and imagination is independent of logic but they are not mutually exclusive.
...logic can reach everywhere.
Can you prove this, logically?
Nick -
Logic leads to contradictions, but it isn't wise to just not use logic.
Some methods lead to contradictions and it is wise to not use them.
Inductive arguments are, by their nature, inconclusive, but they do often allow us a high degree of certainty, enough to have reliable predictability and technology which builds computers and puts things into outer space. It is good, though, to remember that there is a possibility that we could be wrong. Dogmatic faith, even in logic, gets in the way of positive progress.
I agree with the sentiment but express it differently, I would say it is important to recognise the assumptions that lead to the conclusions.
Sure it was
Sure it was! You used logic to determine that at this point in time, with your current knowledge and experience taken in to account, either choice is likely to lead to the result you desire.
Wm
But reason doesn't guide that first choice.
You make a choice. It is a baseless choice. Yes, you may get more information on which you can apply reason later. However, that first choice was not guided by logic. It was free.
bis bald,
Nick
Experience guided by reason
You make a choice: and try it and see if you are right. Reason will guide you in that evaluation. Reality is the final arbiter of truth.
Wm
You didn't answer.
How do you choose the first option?
You are evading.
bis bald,
Nick
Omnicience
You are again arguing for omniscience. In each of these cases there was a right answer, it was just unknown at the time. Further experiment and observations would have revealed the correct answer. We are not paralyzed to inaction by reason when all of reality is not known. In fact, it is because everything is not known automatically that we need reason. You will make it very far in a modern philosophy department with these kinds of contradictory views -- but you will not find the truth by holding on to them.
Wm
Good try.
Sometimes, one option precludes the others. One may be faced with being a doctor or a lawyer and only have the time and resources for one. People do face real dilemmas.
Would you simply pick, for your first option, without using reason, using a flip of the coin? See, logic doesn't tell you which option to choose first.
I often go for walks in a nature preserve with several paths. Sometimes I get lost. I have to decide if I should keep following the path I'm on or turn around and try to go back. By going back, however, I could be going much further than I would if the trial leads right to where I want to go. I usually end up continuing on the path and trying to use my instincts to go in the right direction. Sometimes it works, and sometimes it doesn't. Fortunately, I have always found my way back eventually. Just think, though, if you were lost in the everglades or in a dessert where there are no landmarks, what would you do?
Elvis wanted to make some serious movies and probably would have been happier if he had a challenge. However, the Colonel explained to him, very logically, how much time and effort those serious movies would take, and he is still making lots of money with the low quality movies he was churning out. He could make several of them in the time it took to make West Side Story. So, Elvis subjugated himself to the logical path. He did not flourish. Perhaps he would not have gotten fat and killed himself with drugs if he had taken the less logical path.
I had a chance, with Trade Act Readjustment Allowance, to go back to college for two years. I could have choosen to go after a masters in philosophy and try to get a job teaching philosophy in a community college somewhere. However, I went after another undergaduate major in English and got teaching certification at the secondary level. I'm using that now to sub in high schools as I keep trying to get hired as a regular teacher. My plan is to make lost of money by being a teacher and then get my graduate degree in philosophy and become a philosophy teacher. I took the logical path, but I'm still just a substitute teacher. Sometimes I wish I would have gone for the masters in philosophy first.
bis bald,
Nick
Reason
Through reason. You pick one and test it. Then you observe the results.
Wm
They are equally the same
Suppose one uses observation and logic to determine that all paths are equally the same. How does logic determine which path to follow?
bis bald,
Nick
Logic does reach
When you are facing several paths all worn equally the same, logic will not tell you which one to follow.
What tool did you use to determine that each path was equally the same?
Wm
Where logic doesn't reach.
Contrary to the rantings of the Mad Hatter, logic can reach everywhere.
When you are facing several paths all worn equally the same, logic will not tell you which one to follow. When you are in the middle of an open field with no paths and no landmarks, you must simply make a baseless choice. No amount of logic or reasoning will help you. And, there are situations in life which are analogous to these. Usually they are the most important decisions, like which occupation should you pursue, in what subject should you major, should you marry now or later. Sometimes, you can narrow the choice, but sometimes, the paths are equally the same, and logic doesn't reach.
Logic didn't help me when I decided to go back to Germany after I first completed college. I could have stayed in the States. I was sort of forced to come back to the States when my job in Germany disappeared, but I could also have stayed there and gotten another job. Camus's stranger shot the Arab but couldn't explain why. Alice fell down the hole and walked though the door to Objectivist Land. It wasn't logic which forced her to do that. Sometimes, stuff just happens.
This should be enough for a prima facie case that logic doesn't reach everywhere. It's been made several times on this site. If these guys keep claiming that logic reaches everywhere, make them refute this case and make their own.
bis bald,
Nick
Contradictions and inconclusiveness
Our approaches differ, if I find a method that results in contradictions then I'll intentionally not use that method. And if I recognise that the truth of an idea is logically inconclusive then I should remember that it may or may not be true.
Logic leads to contradictions, but it isn't wise to just not use logic. Inductive arguments are, by their nature, inconclusive, but they do often allow us a high degree of certainty, enough to have reliable predictability and technology which builds computers and puts things into outer space. It is good, though, to remember that there is a possibility that we could be wrong. Dogmatic faith, even in logic, gets in the way of positive progress.
bis bald,
Nick
Logic
If logic is the art of non-contradictory identification, how can you use non-contradictory identification to produce a contradiction?
This is Rand's definition of logic, and it is loaded to give her the results she wants. If I want a definition of automobiles that avoids all blue automibiles, I'll say they are four-wheeled passenger vehicles with built-in engines, and they must be non-blue. If logic is the science of reasoning and can be studied in formal systems, and it is discovered that some procedural rules and principles of logic lead to contradictions and inconclusiveness when they are consistently followed,then we have to either accept that or try to prove it isn't true. Merely trying to redefine logic won't work. In fact, it is al lot like trying to define God into existence by saying He is an existing being.
This is circular logic an an attack on identity. Nick, I fear that you hold on to contradictions. Contradictions do not exist. When you come to a contradiction you have an error in your thinking.
"The sentence following this one is true. The sentence prior to this one is false." Hey, there's a contradiction. Where's the error?
bis bald,
Nick
You've given me plenty of crap.
It's telling that the only support you've had on both your threads attacking logic is from a Christian. And even that's been scant!
First, that's not the kind of support I'm talking about when I talk about unsupported accusations. I'm looking for support in the form of reasoning and evidence, which you lack. All you do is make accusations and call me names. That is not using logic. It's just being a boring jerk. Second, it is evidence of your bigotry again that you think all Christians can never be reasonable. That's not a logical conclusion. It's a fallacious bias.
Rest assured that this world will not be a more "interesting" place with more less-logical nutcases like you. In fact, your illogical windbaggery is the most boring thing on this blog.
There we go again. More name-calling and insults. Not much logic at all. An unsupported accusation. No refutation of any of my arguments and examples. No examples of his own. This is the way Jameson debates. I think, between him and me, I am the more logical.
Your wish is granted.
Good, let's see if he keeps his word this time.
bis bald,
Nick
Reed...
I'm not twisting your argument: you seem to be saying that imagination and logic are mutually exclusive; that Einstein wasn't using logic when he was letting his mind loose on the uncharted parts of our universe.
Contrary to the rantings of the Mad Hatter, logic can reach everywhere.
Glenn - Imagination without
Glenn -
Imagination without logic is useless daydreaming...
Twisting my argument like this is pointless.
Nick -
Reed: And if you identify a method that produces contradictory or inconclusive results then you have identified a method which should not be used, logically, to get conclusive results.
Nick: Logic does produce contradictions and is often inconclusive. That is why we are free, not confined by logic.
Our approaches differ, if I find a method that results in contradictions then I'll intentionally not use that method. And if I recognise that the truth of an idea is logically inconclusive then I should remember that it may or may not be true.
I understand your position but I disagree with your conclusion (or inconclusion) on this matter and any argument put forward to contradict logic will simply prove (to me, but not you) that it is an unsound argument so there isn't much room for discussion on this point.
WRT Square circles (from another thread)-
While neither squares nor circles can not exist in reality (being 2 dimensional) mathematically an infinitely small circle and infinitely small square are identical - ie. a point.
Cheers,
Reed
Logically demonstrate weaknesses in logic!
If logic is the art of non-contradictory identification, how can you use non-contradictory identification to produce a contradiction? This is circular logic an an attack on identity. Nick, I fear that you hold on to contradictions. Contradictions do not exist. When you come to a contradiction you have an error in your thinking.
Wm
I've given you plenty
of context and evidence, Otani - and you know it.
It's telling that the only support you've had on both your threads attacking logic is from a Christian. And even that's been scant!
Rest assured that this world will not be a more "interesting" place with more less-logical nutcases like you. In fact, your illogical windbaggery is the most boring thing on this blog.
Your wish is granted.
Go away, Jameson.
Either learn to debate or leave me alone. I don't appreaciate being called dishonest and a twat and a second-hander etc. I spent a long time talking about what I mean.
What did you call me in another thread, a context-dropping scumbag? This is what you are here.
Nick
What the fuck????
Nick: "Okay, I'm wary of " too much" logic."
Nick: "You should probably use a little more logic than you do."
And around and around you go....
You're dishonest, Otani...
you can't concede that you're own words prove your wariness of logic.
You seem to think life would be more interesting if we were more illogical. Honestly, mate, you're on the wrong blog. You're looking more and more like a tool with every post you make.
Okay, I'm wary of " too much" logic
I'm also wary of too much water, food, sunlight, and anything. How is that a bad thing? We should be wary. I am no more wary of logic than I am of these other things. I don't bow down to logic and treat it as a substitute God. I do not treat as a blasphemer anyone who criticizes logic.
You should probably use a little more logic than you do. Calling people names is not using logic.
bis bald,
Nick
Logic without imagination
Imagination without logic is useless daydreaming, in which pigs can fly, Jesus can rise, and Nick Otani can prove that too much logic is a bad thing.
Yes, logic without imagination is useless in situations where logic cannot reach, and it can be predictable and boring. (I've talked about this several times now and provided several examples. If Jameson had any imagination, he could think of a few himself.)
bis bald,
Nick
You're a mongrel chasing his tail...
You asked me to prove that you were wary of logic. DONE!!! PROVED!!!! END OF FUCKING STORY!!!!!
How is this untrue?
You agreed with me that logic is a tool that we can use, not something which should control us.
bis bald,
Nick
"Show me where I am wary of logic."
Nick: "We should use logic, but like drugs and alcohol, it must be used with caution."
Reed...
Imagination without logic is useless daydreaming, in which pigs can fly, Jesus can rise, and Nick Otani can prove that too much logic is a bad thing.
Show me where I am wary of logic.
A hammer, like logic, is there to be used - and as long as you have a good grasp of it you shouldn't be afraid of it.
It's no surprise to me that you remain wary of it.
I'm not wary of hammers or logic, Jameson. I use logic a lot, more than you do, it seems.
bis bald,
Nick
Logic can be used but only so far
And if you identify a method that produces contradictory or inconclusive results then you have identified a method which should not be used, logically, to get conclusive results.
Logic does produce contradictions and is often inconclusive. That is why we are free, not confined by logic.
bis bald,
Nick
Tool
Nick: "Is a hammer your friend, Jameson?"
A hammer, like logic, is there to be used - and as long as you have a good grasp of it you shouldn't be afraid of it.
It's no surprise to me that you remain wary of it.
Nick, I agree with some of
Nick, I agree with some of what you express.
Albert Einstein said "Imagination is more important than knowledge", this says to me that logically building on knowledge wasn't enough for Einstein to make all of his discoveries and that imagination was required for at least some of them.
In that way we shouldn't be constrained by logic, however, if our ideas are logically impossible then we are deceiving ourselves if we consider them possible.
And if you identify a method that produces contradictory or inconclusive results then you have identified a method which should not be used, logically, to get conclusive results.
Read the article
One can logically demonstrate weaknesses in logic.
bis bald,
Nick
how?
By what means could you disprove logic?
Logic is our friend, Nick...
Is a hammer your friend, Jameson?
bis bald,
Nick
Exactly where are you disagreeing with me?
"The senses are man's primary means of contact with reality; they give him the precondition of all subsequent knowledge, the evidence that something is. What the something is he discovers on the conceptual level of awareness." (aynrand.org)
But we can't always trust our senses, and we can't always trust logic. If you think we can, please prove it.
bis bald,
Nick
-
Well said, wngreen and Jameson.
And an attack on reason
"I think a hammer can often be a useful tool. We should use hammers, but like drugs and alcohol, it must be used with caution. We should not allow a hammer to use us.
Logic is our friend, Nick...
Standard attack on perception
This is a fairly standard attack on perception. Omniscience is not a requirement, nor even possible, in observation. This is just a restatement of the view that human perception is unreliable because it is limited by the nature of sensory organs. Rand identified the fallacy of this argument quite succinctly: "man is blind, because he has eyes—deaf, because he has ears." Because sensory organs, like any other entity, have an identity they are limited in nature. They can not be asked to do anything more then what they do. Our ears tell us what we hear, not what is making the sound. Our eyes show us what we see. It is up to us to use that information and integrate it. "Epistemology exists because man is a limited fallible being who learns in disjointed incremental steps and who therefore requires a proper procedure to acquire the knowledge necessary to act, survive, and flourish." (Younkins)
"The senses are man's primary means of contact with reality; they give him the precondition of all subsequent knowledge, the evidence that something is. What the something is he discovers on the conceptual level of awareness." (aynrand.org)
Wm