The best way to learn mathematics is to do mathematics.

The most important thing is to be able to think like an economist, to see the world through that lens.

Those who do not have power over the story that dominates their lives, the power to retell it, rethink it, deconstruct it, joke about it, and change it as they change, truly are powerless, because they cannot think new thoughts.

不要相信你认为自己相信的一切。

好奇心推动数学家前进，总是在寻找下一个要回答的问题。

荒，荒淫。乱，动乱。之，的。萌，根源、萌芽。 统治者的荒淫是国家动乱的根源。这是魏源的政治卓见。因为统治者一旦荒淫，就不会以国事为重了。如此，上下交怨，天下岂能不乱？因此，力戒荒淫，乃是当权者应当牢记的信念。