当现有约束被放松时，经济增长就会发生，这使得个人能够追求以前无法获得的机会。

Collaboration across disciplines is essential for groundbreaking discoveries.

The pursuit of mathematical knowledge is a journey that never ends.

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.

How far you go in life depends on your being tender with the young, compassionate with the aged, sympathetic with the striving and tolerant of the weak and strong. Because someday in your life you will have been all of these.