When we remember we are all mad, the mysteries disappear and... - Mark Twain

"It usually takes me two or three days to prepare an impromptu speech."

"If books are not good company, where shall I find it?"

"Humor is mankind's greatest blessing."

"Everyone is a moon, and has a dark side which he never shows to anybody."

"Everything human is pathetic. The secret source of humor itself is not joy but sorrow. There is no humor in heaven."