数学不仅仅是关于数字、方程、计算或算法：它是关于理解的。

There are things that happen and leave no discernible trace, are not spoken or written of, though it would be very wrong to say that subsequent events go on indifferently, all the same, as though such things had never been.

人类的进步和胜利全靠发自内在的力量。