【释义】上天要把重任降临在某人的身上前，必定先磨炼他的心理和意志。

"The beauty of computational complexity lies in its ability to reveal the inherent difficulty of problems, regardless of the specific algorithms used to solve them."

有权势的天子，也未必尊贵；穷苦的平民，也未必低贱。贵贱的分别，在于行为的美恶。

"The world is full of people who have never, since childhood, met an open doorway with an open heart."

世界是残酷的，但它也是美丽的。