We are nearer neighbors to ourselves than the whiteness of snow or the weight of stones are to us: if man does not know himself, how should he know his functions and powers?

We do not correct the man we hang; we correct others by him.

Whenever a new finding is reported to the world people say - It is probably not true. Later on, when the reliability of a new finding has been fully confirmed, people say - OK, it may be true but it has no real significance. At last, when even the significance of the finding is obvious to everybody, people say - Well, it might have some significance, but the idea is not new.

The most profound joy has more of gravity than of gaiety in it.

It is a thorny undertaking, and more so than it seems, to follow a movement so wandering as that of our mind, to penetrate the opaque depths of its innermost folds, to pick out and immobilize the innumerable flutterings that agitate it.

I see several animals that live so entire and perfect a life, some without sight, others without hearing: who knows whether to us also one, two, or three, or many other senses, may not be wanting?

In nine lifetimes, you'll never know as much about your cat as your cat knows about you.