"The truth is always something that is told, not something that is known. If there were no speaking or writing, there would be no truth about anything. There would only be what is."

在数学中，提出问题的艺术必须比解决问题更有价值。

解释：对别人的灾祸而幸灾乐祸是不仁义的，乘别人的危难去攻击不符合武德。

有喜怒哀乐之情却没有发作，这是从凡人之心直接追溯到道德之心，使人们存心修养；虽未发生但却有喜怒哀乐的表现，这是由道心指出人心的缺欠，要人们反省改正。

Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.

跑步的快乐不在于终点线，而在于旅程。