I'm not interested in playing the same character twice.
One must be a god to be able to tell successes from failures without making a mistake.
The inflationary universe model provides a possible explanation for the origin of the universe.
The flower is the star, the star is the flower.
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.
大自然赋予我形体使我负载，赋予我生命使我劳碌，使我变老以得到安闲，使我死亡以得到安息。所以能把活着当作好事，也就能把死去当作好事了。