Feeling alone guides the mind.

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.

The minds that rise and become really great are never self-satisfied, but still continue to strive.

To be worthy of the name, an experimenter must be at once theorist and practitioner. While he must completely master the art of establishing experimental facts, which are the materials of science, he must also clearly understand the scientific principles which guide his reasoning through the varied experimental study of natural phenomena. We cannot separate these two things: head and hand. An able hand, without a head to direct it, is a blind tool; the head is powerless without its executive hand.

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

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

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.