"Health and cheerfulness mutually beget each other." - JOSEPH ADDISON, The Spectator

"A merry heart doeth good like a medicine." - BIBLE, Proverbs 17:22

"So of cheerfulness, or a good temper - the more it is spent, the more of it remains." - RALPH WALDO EMERSON, The Conduct of Life

"The plainest sign of wisdom is a continual cheerfulness: her state is like that of things in the regions above the moon, always clear and serene." - MICHEL DE MONTAIGNE, Essays