A gem cannot be polished without friction, nor a man perfected without trials. - Chinese Proverb. [중국 속담]
"A gem cannot be polished without friction, nor a man perfected without trials." - Chinese Proverb. "보석은 마찰 없이 세공이 될 수 없고, 사람 또한 시련 없이는 완벽해질 수 없다." - 중국 속담. The Wisdom of Friction: Polishing Gems and Perfecting Humans A Chinese p…