The motor of our ingenuity is the question ‘Does it have to be like this?’, from which arise political reforms, scientific developments, improved relationships, better books.

凡是合理的都是存在的，凡是存在的都是合理的。

I've learned that you can't control everything, but you can control how you react to it.

对这个世界有所助益是获得快乐的唯一途径。