译文：读书是为了明白事理，做事就应当竭尽自己的心力。

每一棵种植的树都是治愈地球的一步，但真正的改变需要系统性行动。

In the state of nature, indeed, all men are born equal, but they cannot continue in this equality. Society makes them lose it, and they recover it only by the protection of the laws.

启发式研究揭示了我们如何简化复杂问题，有时会导致错误。