灵魂被放置在身体里，就像一颗粗糙的钻石，必须经过打磨，否则它的光泽永远不会显现。

A mathematician's work is never done; there are always new questions to ask and new mysteries to solve.

Gratitude unlocks the fullness of life. It turns what we have into enough, and more. It turns denial into acceptance, chaos to order, confusion to clarity. It can turn a meal into a feast, a house into a home, a stranger into a friend.

煤炭的真正价值在于我们如何负责任地开采和使用它。