Theories are like a stairway; by climbing, science widens its horizon more and more, because theories embody and necessarily include proportionately more facts as they advance.

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.

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

Isn't elegance forgetting what one is wearing?

My mother was determined to make us independent. When I was four years old, she stopped the car a few miles from our house and made me find my own way home across the fields. I got hopelessly lost.

Love wins when everything else will fail.

The Jiu Jitsu I created was designed to give the weak ones a chance to face the heavy and strong.

A friend is a beloved mystery; dearest always because he is not ourself, and has something in him which it is impossible for us to fathom. If it were not so, friendship would lose its chief zest.

Vision without execution is delusion. The joy is in the results

Humor is essential to a full and happy life. It is a reliever and relaxer of pressure and tension, and the saving element in many situations.

A human soul devoid of longing was a soul deformed, deprived of its highest good, sick unto death.

I mean I'm talking about playing games, about imagining other people, and it's part of the way that it helps you actually see the world.

You hated him in the movies! Now you're ambivalent.