我相信自爱的力量。

如果我看得更远，那是因为我站在巨人的肩膀上。

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.

人是自己的囚犯。

The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.