Weaseling out of things is important to learn. It’s what separates us from the animals—except the weasel.

An ape will be an ape, though clad in purple.

It is remarkable that only small birds properly sing.

Histories are more full of examples of the fidelity of dogs than of friends.

Go to the ant, you lazybones; consider its ways, and be wise.

Animals are in possession of themselves; their soul is in possession of their body. But they have no right to their life, because they do not will it. 

How like to us is that filthy beast the ape.

Man is the only animal for whom his own existence is a problem which he has to solve and from which he cannot escape.

Alas! We are ridiculous animals.

Man is no man, but a wolf, to a stranger.

Man, when perfected, is the best of animals, but when separated from law and justice, he is the worst of all. 

Animals are good to think with.

We call them dumb animals, and so they are, for they cannot tell us how they feel, but they do not suffer less because they have no words.