The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.

数学家的直觉和严谨的证明同样重要。

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.

历史不仅仅是关于国王和王后的；它是关于普通人及其非凡生活的。

Without ecological balance, there is no real economic benefit.