"The only way to learn mathematics is to do mathematics."

Never try to discourage thinking, for you are sure to succeed.

生命的历史是适应的历史。

The difference between a moral man and a man of honor is that the latter regrets a discreditable act even when it has worked.

虚假的幸福使人变得刻薄和傲慢，而这种幸福从不传播。真正的幸福使他们善良和明智，而这种幸福总是分享的。

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。