"To be happy, we must love, and love, and love! Always love--that is the secret."

"Without knowing what I am and why I am here, it is impossible for me to live, and I cannot know that; therefore I cannot live."

"If you want to be happy, be."

"The sole meaning of life is to serve humanity."

"Our body is a machine for living. It is organized for that. Stop him at once to work, and you will be surprised how soon it gets rusty."