"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."

"It is a mistake to regard age as a downhill grade toward dissolution. The reverse is true. As one grows older, one climbs with surprising strides."

"As we grow olda€|the beauty steals inward."

"An old doting fool, with one foot already in the grave."

"I am not young enough to know everything."

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

"It is a sadness of growing older that we lose our ardent appreciation of what is new and different and difficult."