I was wise enough never to grow up, while fooling people into believing I had. - Margaret Mead

It is utterly false and cruelly arbitrary... to put all the play and learning into childhood, all the work into middle age, and all the regrets into old age.

If one cannot state a matter clearly enough so that even an intelligent twelve-year-old can understand it, one should remain within the cloistered walls of the university and laboratory until one gets a better grasp of one's subject matter.

It may be necessary temporarily to accept a lesser evil, but one must never label a necessary evil as good.