The most perfect ape cannot ...

The most perfect ape cannot draw an ape; only man can do that; but, likewise, only man regards the ability to do this as a sign of superiority.
 Georg C. Lichtenberg

Quotes from the same author

We accumulate our opinions at an age when our understanding is at its weakest.
 Georg C. Lichtenberg
Even truth needs to be clad in new garments if it is to appeal to a new age.
 Georg C. Lichtenberg
I am confident of my ability to demonstrate that one can sometimes believe in something and yet not believe in it. Nothing is less fathomable than the systems that motivate our actions.
 Georg C. Lichtenberg
Honest unaffected distrust of human abilities under all circumstances is the surest sign of strength of mind.
 Georg C. Lichtenberg
Those who have racked their brains to discover new proofs have perhaps been induced to do so by a compulsion they could not quite explain to themselves. Instead of giving us their new proofs they should have explained to us the motivation that constrained them to search for them.
 Georg C. Lichtenberg