"I am an agnostic; I do not pretend to know what many ignorant men are sure of."

"The world is made up for the most part of morons and natural tyrants, sure of themselves, strong in their own opinions, never doubting anything."

"The pursuit of truth will set you free; even if you never catch up with it."

"When I was a boy I was told that anybody could become President I'm beginning to believe it."

"Fortitude is the quiet voice at eventide saying: I will try once more tomorrow. Reflect upon this whenever doubt clouds your horizon."

"It's hard to tell how far women's individuality has come in the past twenty years."

"If you are giving a graduate course you don't try to impress the students with oratory, you try to challenge them, get them to question you."

"Be kind, for everyone you meet is fighting a hard battle."