不愤不启，不悱不发；举一隅不以三隅反，则不复也。
【讲解】：（教学生）不到他苦思冥想怎么也弄不明白的时候，不去开导他；不到他想说而又说不出来的时候，不去启发他。告诉他（四方形）的一个角，他不能由此推出另外三个角，就不再往下教他（新知识）了。
I have made a ceaseless effort not to ridicule， not to bewail， not to scorn human actions， but to understand them.
I don't know what I'ma be, but I know what I won't be - broke.
The true joy of mathematics lies in the act of discovery, not just the result.
一个组织的价值观质量决定了其文化的质量。
The past is a foreign country; they do things differently there.