在一个国家中，一个人的自由止于另一个人的自由开始之处。
In a state, one man's liberty ends where another's begins.
What's left out is as important as what's included.
阅读好书，就如同与过去几个世纪最杰出的人物交谈。
Your work is going to fill a large part of your life, and the only way to be truly satisfied is to do what you believe is great work.
The truth is, the science of Nature has been already too long made only a work of the brain and the fancy: It is now high time that it should return to the plainness and soundness of observations on material and obvious things.
The past is not dead, it is not even past.
记忆是个狡猾的东西 - 它既是牢笼也是解放。
The only limits you have are the limits you believe.