The search for a theory of everything is one of the most exciting and challenging quests in modern physics.

乐观是一种工具，你可以用它来实现你为自己设定的目标。

They had said that the city was a paradise, but I found it a hell.

Regret is the poison we drink hoping someone else will die.

最伟大的老师是那些告诉你去哪里看，但不告诉你该看到什么的人。