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.

True progress comes from challenging the status quo.

唯一比思想的力量更伟大的是心灵的勇气。

真正的智者，是知其然，也知其所以然。永远明白自己在做什么，要做什么！清醒，问心无愧，活得明明白白！