"There is no greatness where there is not simplicity, goodness, and truth."

"It is not the quantity of knowledge but the quality of knowledge that determines the future of humanity."

"It is easier to make a saint out of a libertine than out of a cold and respectable man."

"The most difficult thing is to love the world and not to despise it."

"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."