As in geometry the most natural way of beginning is from a mathematical point, so is the same method in observations and natural history the most genuine, simple, and instructive.

The only way to have a friend is to be one.

生活中最大的荣耀不在于从不跌倒，而在于每次跌倒后都能站起来。

爱情并不遵从我们的想象。爱情的神秘之处就在于它的纯洁与纯粹。

The writer must believe that what he is doing is the most important thing in the world. And he must hold to this illusion even when he knows it is not true.

经济发展的关键不仅仅是资源或技术，而是正确的制度和政策。