Every person must have a thought that changes them, or a book, or a word, or a moment; and if they don't, their life is wasted.
Music can change the world because it can change people.
A city’s architecture should inspire its citizens.
要理解心灵，就要研究它在现实生活中的运作。
质量在价格被遗忘后仍会被长久铭记。
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.