“Your existence is the only proof of mine”

“The only proof he needed for the existence of God was music.”

“The proof that the little prince existed is that he was charming, that he laughed, and that he was looking for a sheep. If anybody wants a sheep, that is a proof that he exists.”

“It's gratifying to know that you've appeared in someone else's dreams. It's proof that you exist, in a way, proof that you have substance and value outside the walls of your own mind.”

“If I should ever die, God forbid, let this be my epitaph:THE ONLY PROOF HE NEEDEDFOR THE EXISTENCE OF GODWAS MUSIC”

“Achievement of your happiness is the only moral purpose of your life, and that happiness, not pain or mindless self-indulgence, is the proof of your moral integrity, since it is the proof and the result of your loyalty to the achievement of your values.”