As human beings our greatness lies not so much in being able to remake the world - that is the myth of the atomic age - as in being able to remake ourselves.

The denunciation of the young is a necessary part of the hygiene of older people and greatly assists the circulation of the blood.

The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes but you don't change at all. And that of course causes great confusion.

How incessant and great are the ills with which a prolonged old age is replete.

Anyone who stops learning is old whether at twenty or eighty. Anyone who keeps learning stays young. The greatest thing in life is to keep your mind young.