解释：将自己的利益给了别人，别人也将会把实惠返回给自己；将自己的怨恨发泄给别人，祸害也将会降临到自己身上。

The study of mathematics is the indispensable basis for all intellectual and spiritual progress.

"The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion."

我仍未找到我所追寻的。