“The most certain sign of wisdom is cheerfulness.”– Michel de Montaigne Related Quotes “Purity engenders Wisdom, Passion avarice, and Ignorance folly, infatuation and darkness.”– Cyril Connolly “Spectacular achievement is always preceded by unspectacular preparation.”– Robert H. Schuller “Common sense in an uncommon degree is what the world calls wisdom.”– Samuel Taylor Coleridge