The mathematician does not study pure mathematics because it is useful; he studies it because he delights in it and he delights in it because it is beautiful.
The United States, in their expansive capacity, are capable of containing within their limits the whole population of the earth.
你不能等待别人来安排你的人生，自己想要的，自己争取。
一个人不论年龄多大，都要学习自己不懂的东西。这不是羞耻。
真正的领导力在于服务他人，而非命令他人。
Sometimes the hardest thing and the right thing are the same.