"The only limit to our realization of tomorrow is our doubts of today."

If you want to be successful, you have to be willing to make tough decisions.

每个词都是一个世界。

"There is no such thing as a single version of history; there are only perspectives."

"The past is not a static pageant, it moves with us, changing as we change."

在理论物理学的领域里，每一个发现都会带来新的问题和挑战。