"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."

"Of all the self-fulfilling prophecies in our culture, the assumption that aging means decline and poor health is probably the deadliest."

"Aging is not 'lost youth' but a new stage of opportunity and strength."

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

"Where is the path to Grown-Up Land? How do I get there? Or will I just get old, not understanding that I'm no longer young?"

"To get back my youth I would do anything in the world, except take exercise, get up early, or be respectable."

"You don't stop laughing because you grow old. You grow old because you stop laughing."