寶石需摩擦才會發光，人必經嘗試才能完美。 A gem cannot be polished without friction, nor a man perfected without trials.

寶石需摩擦才會發光，人必經嘗試才能完美。 A gem cannot be polished without friction, nor a man perfected without trials.
古羅馬哲學家 塞內卡 Lucius Annaeus Seneca