We must alter theory to adapt it to nature, but not nature to adapt it to theory.‎

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

The fact that knowledge endlessly recedes as the investigator is about to grasp it is what constitutes at the same time his torment and happiness.

The eloquence of a scientist is clarity; scientific truth is always more luminous when its beauty is unadorned than when it is tricked out in the embellishments with which our imagination would seek to clothe it.

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

The science of life is a superb and dazzlingly lighted hall which may be reached only by passing through a long and ghastly kitchen.

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.