"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."

"Beware of the young doctor and the old barber."

"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."

"I didn't mind getting old when I was young. It's the being old now that's getting to me."

"A person is always startled when he hears himself seriously called an old man for the first time."

"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."

"Sure I'm for helping the elderly. I'm going to be old myself some day."