So given a Time Turner, I would tell my 21-year-old self that personal happiness lies in knowing that life is not a check-list of acquisition or achievement. Your qualifications, your CV, are not your life, though you will meet many people of my age and older who confuse the two. Life is difficult, and complicated, and beyond anyone’s total control, and the humility to know that will enable you to survive its vicissitudes.

Every small step toward sustainability compounds into a wave of global impact.

最高深的道理往往是最简单的，但演化出的变化却极其复杂。

如果程序处理大量数据，则它会以几种方式进行处理。

知识只有在应用时才有用。

没有人是自由的，甚至连鸟儿都被天空束缚。

如果你真的想成功，就不要害怕失败。