Kelley

“The soul in which philosophy dwells should by its health make even the body healthy. It should make its tranquillity and gladness shine out from within; should form in its own mold the outward demeanor, and consequently arm it with a graceful pride, an active and joyous bearing, and a contented and good-natured countenance. The surest sign of wisdom is constant cheerfulness.”
― Michel de Montaigne, The Complete Works: Essays, Travel Journal, Letters