The essence of mathematics lies in its freedom.

The money and effort that men expend on their bodies, they might with greater profit devote to their minds.

我不是商人，我就是生意。

写作是一种生活、呼吸、存在的方式。

"The beauty of formal methods lies in their ability to provide absolute guarantees about system behavior."

译文：月亮过了十五后，就逐渐不明亮了，人到了中年之后，做什么事都难以有大作为。赏析：青少年是人生最美好的时期，这个时期精力最旺盛，记忆力最强，也是人生最该努力奋斗的时候。