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

Mark Twain

Humor must not professedly teach and it must not professedly preach, but it must do both if it would live forever.

Mark Twain

Humor is the first of the gifts to perish in a foreign tongue.

Virginia Woolf

A sense of humour is the only divine quality of man.

Arthur Schopenhauer