"Life is a voyage. A ship is not built for a harbor."

"A man is not idle because he is absorbed in thought. There is a visible labor and there is an invisible labor."

"Be like the bird that, pausing in her flight awhile on boughs too slight, feels them give way beneath her, and yet sings, knowing she hath wings."

"Change your opinions, keep your principles."

"The word 'love' is not a verb."