To realize one’s nature perfectly---that is what each of us is here for.
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.
If ease of use was the only requirement, everyone would still be riding tricycles.
如果你不为产品的第一个版本感到尴尬,那说明你发布得太晚了。
The most important challenge facing the world today is the need to create strong, effective, and accountable states in the developing world.