相对论不仅仅是一种科学理论，而且是一种哲学理论，它深刻地影响了我们对宇宙的概念。
成功的关键是专注于基础并完美地执行它们。
The great cause of the prosperity of the country is liberty—liberty in the economic system.
We don't read and write poetry because it's cute. We read and write poetry because we are members of the human race. And the human race is filled with passion. Medicine, law, business, engineering: these are noble pursuits and necessary to sustain life. But poetry, beauty, romance, love...these are what we stay alive for.
图书馆是活书的墓地，每一本都在等待读者将其复活。
——在逆境中始终百折不挠，1913年