Science advances, not by the accumulation of new facts, but by the continuous development of new concepts.

Some of mankind's most terrible misdeeds have been committed under the spell of certain magic words or phrases.

Behold the turtle. He makes progress only when he sticks his neck out.

Education is what is left after all that has been learnt is forgotten.

Each honest calling, each walk of life, has its own elite, its own aristocracy based on excellence of performance. . . . There will always be the false snobbery which tries to place one vocation above another. You will become a member of the aristocracy in the American sense only if your accomplishments and integrity earn this appellation.

The stumbling way in which even the ablest of the scientists in every generation have had to fight through thickets of erroneous observations, misleading generalizations, inadequate formulation, and unconscious prejudice is rarely appreciated by those who obtain their scientific knowledge from textbooks.

Every vital organization owes its birth and life to an exciting and daring idea.