世界不是游乐场，而是思想和利益的战场。
We are punished by our sins not for them.
The pain of discipline is better than the pain of regret.
我相信梦想的力量。
我不是为了娱乐而唱歌。我为那些经历过地狱又回来的女人唱歌。
Curiosity is the driving force behind all great mathematical discoveries.
The essence of mathematics lies in its freedom.
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
数学不是关于数字、方程、计算或算法的：它是关于理解的。