“Feeling alone guides the mind.”

If I had to define life in a single phrase, I should clearly express my thought of throwing into relief one characteristic which, in my opinion, sharply differentiates biological science. I should say: life is creation.

First causes are outside the realm of science.

The great experimental principle, then, is doubt, that philosophic doubt which leaves to the mind its freedom and initiative, and from which the virtues most valuable to investigators in physiology and medicine are derived.

A great discovery is a fact whose appearance in science gives rise to shining ideas, whose light dispels many obscurities and shows us new paths.

A discovery is generally an unforeseen relation not included in theory.

Well-observed facts, though brought to light by passing theories, will never die; they are the material on which alone the house of science will at last be built.

Particular facts are never scientific; only generalization can establish science.

Men who believe too firmly in their theories, do not believe enough in the theories of others. So these despisers of their fellows make experiments only to destroy a theory, instead of to seek the truth.

The true worth of an experimenter consists in his pursuing not only what he seeks in his experiment, but also what he did not seek.

The mental never influences the physical. It is always the physical that modifies the mental, and when we think that the mind is diseased, it is always an illusion.

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

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.

The terrain is everything; the germ is nothing.

The joy of discovery is certainly the liveliest that the mind of man can ever feel.

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

The better educated we are and the more acquired information we have, the better prepared shall we find our minds for making great and fruitful discoveries.

The man who reads everything is like the man who eats everything: he can digest nothing, and the penalty of crowding one’s mind with other men’s thoughts is to have no thoughts of one’s own.

I’d be in the backyard minding my own business. The other kids would call me names, like meatball head or neo-Calvinist. I’d run after them, but lucky for them the chain would snap my neck back.

When the heart is right, the mind and the body will follow.

That’s not very attractive behavior, Bella. he said. Forgiveness is divine. Mind your own buisness.

And whenever my mind wanders, it is always to you.

If you can hit your opponent with two punches, you don’t hit him with one. Get off with some bad intentions in there. Believe in yourself. A guy can feel it if you don’t believe in yourself. Set your mind to make yourself do it.

I call “crystallization” that action of the mind that discovers fresh perfections in its beloved at every turn of events.

Censorship feeds the dirty mind more than the four-letter word itself.