From the closing scene of the movie CLASH OF THE TITANS:

On Mount Olympus, the Gods reflect on the victory of Perseus over the Kraken:

"What a dangerous precedent...what if one day there were other heroes like him? What if courage and imagination were to become everyday mortal qualities...what would become of us?"

"Then we would no longer be needed! Until then, there is sufficient cowardice, sloth...mendacity...down there on earth to last forever..."