"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."

"He who is of calm and happy nature will hardly feel the pressure of age, but to him who is of an opposite disposition youth and age are equally a burden."

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

"The deepest definition of youth is life as yet untouched by tragedy."

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

"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."

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