太阳不会永远闪耀，但只要它还在，我们不妨一起闪耀。
Sun don't shine forever, but as long as it's here then we might as well shine together.
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.
There is no such thing as innocence, only degrees of guilt.
互联网不是万能的，但它正在改变一切。
You can't use up creativity. The more you use, the more you have.
You have to be able to accept failure to get better.
对任何思考者来说，最大的挑战是以一种允许解决的方式表述问题。