无色的绿色念头愤怒地睡觉。

The most profound ideas in mathematics often arise from the simplest observations.

一件事情都不能做到有始有终，就不要去操持其他的事情；一物也不明白，就不要追求博闻广记。

Geometry is not just about shapes; it is about understanding the space we live in and the relationships within it.

最好的数学不仅正确，而且具有启发性。