"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."

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

"In case you're worried about what's going to become of the younger generation, it's going to grow up and start worrying about the younger generation."

"You're never too old to become younger."

"About the only thing that comes to us without effort is old age."

"People who say you're just as old as you feel are all wrong, fortunately."