"This only is certain, that there is nothing certain; and nothing more miserable and yet more arrogant than man."

"No mortal man, moreover is wise at all moments."

"In these matters the only certainty is that nothing is certain."

"In comparing various authors with one another, I have discovered that some of the gravest and latest writers have transcribed, word for word, from former works, without making acknowledgment."

"The best plan is to profit by the folly of others."

"The only certainty is that nothing is certain."

"Boys don't make passes at female smartasses."

"The most terrible poverty is loneliness and the feeling of being unloved."

"He had a certain frankness and generosity, qualities indeed which turn to a man's ruin, unless tempered with discretion."

"More than any other time in history, mankind faces a crossroads. One path leads to despair and utter hopelessness. The other, to total extinction. Let us pray we have the wisdom to choose correctly."

"We all like stories that make us cry. It's so nice to feel sad when you've nothing in particular to feel sad about."

"Hold yourself responsible for a higher standard than anybody else expects of you. Never excuse yourself. Never pity yourself. Be a hard master to yourself - and be lenient to everybody else."