All the vital mechanisms, varied as they are, have only one object, that of preserving constant the conditions of life in the internal environment.

It is what we know already that often prevents us from learning.

The experimenter who does not know what he is looking for will not understand what he finds.

When we meet a fact which contradicts a prevailing theory, we must accept the fact and abandon the theory, even when the theory is supported by great names and generally accepted.

Man can learn nothing unless he proceeds from the known to the unknown.

The terrain is everything; the germ is nothing.

Art is 'I'; science is 'we'.

A fact in itself is nothing. It is valuable only for the idea attached to it, or for the proof which it furnishes.

Those who do not know the torment of the unknown cannot have the joy of discovery.

Science increases our power in proportion as it lowers our pride.

True science teaches us to doubt and, in ignorance, to refrain.

Art is a person's private vision expressed in aesthetic forms.

If only they could see the things we hide behind those shining eyes and blissful smiles.

When it was too late for rescue, it was still early enough for revenge.

I think you have to be respectful to the people who want to talk to you.

Say and do what you mean, but never say and do it meanly.

You have to learn how to do each book. It's a different world, a different show.

But he knows that no man is an island.

The international trading system was devised by the rich to suit their needs; it ignores those of the poor.

Sooner I'd try to change history than turn political, than try convincing others to write letters or to vote or to march or to do something they didn't already feel like doing.

I dont think about race before I start drawing. I think about how to make that mark to fit whatever purpose I need it to fulfill.