每本书都是一次前往未知世界的旅行，充满了可能性。

游览过五岳之后，其他的山就没什么可看的了；而游览过黄山之后，连五岳也没什么可看的了

In the end, we only regret the chances we didn't take.

"Every observation we make is a step closer to understanding the cosmos."

In the midst of difficult times， it is our response that defines us， not the circumstances.

最好的投资就是投资自己。