The secret of happiness is this: let your interests be as wide as possible, and let your reactions to the things and persons that interest you be as far as possible friendly rather than hostile.
Man's only true happiness is to live in hope of something to be won by him. Reverence something to be worshipped by him, and love something to be cherished by him, forever.
Happiness does not come from doing easy work but from the afterglow of satisfaction that comes after the achievement of a difficult task that demanded our best.