"Perception is strong and sight weak. In strategy it is important to see distant things as if they were close and to take a distanced view of close things."

"The mathematician lives long and lives young; the wings of his soul do not early drop off, nor do its pores become clogged with the earthy particles blown from the dusty highways of vulgar life."

"We are, each of us angels with only one wing; and we can only fly by embracing one another."

"Time is what prevents everything from happening at once."

"A critic is a legless man who teaches running."

"It is better to think too much, than to think too little"

"How can you come to know yourself? Never by thinking, always by doing. Try to do your duty, and you'll know right away what you amount to."

"When the effective leader is finished with his work, the people say it happened naturally."

"When a thought is too weak to be expressed simply, it should be rejected."

"A man is as old as he feels himself to be."

"I have learned over the years that when one's mind is made up, this diminishes fear; knowing what must be done does away with fear."

"Disobedience, in the eyes of anyone who has read history, is man's original virtue. It is through disobedience and rebellion that progress has been made."