"No one can be happy who has been thrust out of the way of truth and wanders about through a labyrinth of error."

"Luck is what happens when preparation meets opportunity."

"Enjoy present pleasures in such a way as not to injure future ones."

"I am not born for one corner; my country is this whole world."

"Hang on to your youthful enthusiasms — you’ll be able to use them better when you’re older."