"Only as you do know yourself can your brain serve you as a sharp and efficient tool. Know your own failings, passions, and prejudices so you can separate them from what you see."

"If you have made a mistake, cut your losses as quickly as possible."

"Old age is always fifteen years older than I am."

"Never answer a critic, unless he's right."

"I am an old man, but in many senses a very young man. And this is what I want you to be, young, young all your life."

"The surprising thing about young fools is how many survive to become old fools."

"Young men's minds are always changeable, but when an old man is concerned in a matter, he looks both before and after."

"The older I grow the more I distrust the familiar doctrine that age brings wisdom."

"With age come the inner, the higher life. Who would be forever young, to dwell always in externals?"

"Old age, calm, expanded, broad with the haughty breadth of the universe, old age flowing free with the delicious near-by freedom of death."