I don't sing because I'm happy. I'm happy because I sing.

Learning consists in the modification of certain mediating processes which operate between the stimulus and the response.

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

数学的乐趣在于旅程，而不仅仅是目的地。

压力可以压垮管道，也可以造就钻石。

夜晚是一个自己照亮自己的世界。