The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all. And that, of course, causes great confusion.

世界上没有像大城市那样的孤独。

Nothing just happens, it's all part of a plan.

当我们意识到维持现状的痛苦大于改变现状的痛苦时，我们就会改变自己的行为。

解释：只要有一人起表率作用，就能带动其他人效仿。一个人的行为和言行影响着他人的行为和态度。

Challenges are what make life interesting. Overcoming them is what makes life meaningful.