True innovation happens at the intersection of necessity and creativity.

数学证明的美在于它的简洁性和必然性。

"La memoria es el territorio donde el escritor planta sus historias, y sin memoria no hay literatura."

只管走过去，不必逗留着采了花朵来保存，因为一路上花朵自会继续开放的。

我不是说唱歌手，我是一个托尼奖得主。

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.