In teaching man, experimental science results in lessening his pride more and more by proving to him every day that primary causes, like the objective reality of things, will be hidden from him forever and that he can only know relations.

The first requirement in using statistics is that the facts treated shall be reduced to comparable units.

The doubter is a true man of science: he doubts only himself and his interpretations, but he believes in science.

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.

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.

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

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