To be free is not merely to cast off one's chains, but to live in a way that respects and enhances the freedom of others.
The beauty of mathematics lies in its ability to describe the universe in a language that is both precise and universal.
这个世界惟有两样东西让我们的心灵感到深深的震撼,一是我们头顶上灿烂的星空,一是我们内心崇高的道德法则。
要养活世界,我们必须先理解它。
A coward is incapable of exhibiting love; it is the prerogative of the brave.
Your work will be endless, but your time is finite. You cannot limit the work so you must limit your time. Hours are the only thing you can manage.