It is the greatest happiness of the greatest number that is the measure of right and wrong.

Happiness is not the absence of problems, but the ability to deal with them.

译文：花开花落已两载，看着盛开的花，想到两年未曾回家，就不免伤心落泪。小船还系在岸边，虽然我不能东归，飘零在外的我，心却长系故园。

数学不仅仅是关于数字、方程、计算或算法：它是关于理解的。