过去和未来一样，都是不确定的，只存在于一系列可能性中。

I don’t think about the past or the future. I focus on the present.

We are survival machines—robot vehicles blindly programmed to preserve the selfish molecules known as genes.

我们学得越多，就越意识到我们不知道的还有很多。

Self-love， then， is a necessary principle of action.