天不再与，时不久留，能不两工，事在当之。
【释义】上天不会重复赐予机遇，时光也不会长久停留；人的才能很难在多个领域都达到精工，成就事业的关键在于把握当下、专注一事。
The more specific you are, the more universal you become.
Never forget what you are, for surely the world will not. Make it your strength. Then it can never be your weakness. Armor yourself in it, and it will never be used to hurt you.
解析：比喻立志用功需要循序渐进。
