Mathematics is not a spectator sport—you have to engage with it to appreciate its beauty.

解释：不在农忙时役使百姓而耽误农时，那么可以保证百姓富裕。

Gather ye rosebuds while ye may,Old time is still a-flying,And this same flower that smiles today,Tomorrow will be dying.

数学中最重要的是提出正确的问题。