The greatest obstacle to being heroic is the doubt whether one may not be going to prove one's self a fool; the truest heroism is to resist the doubt; and the profoundest wisdom, to know when it ought to be resisted, and when it be obeyed.

现代教育者的任务不是砍伐丛林，而是灌溉沙漠。

I'm very proud to be black, but black is not all I am. That's my cultural historical background, my genetic makeup, but it's not all of who I am nor is it the basis from which I answer every question.

现在就是开始选择你的家庭的时候。

宇宙是一个谜题，每一次发现都是让我们更接近完整画面的一块拼图。