意志不坚强的,智慧一定不高;说话不讲信用的,行动也不会果敢;拥有财富而不肯分给人的,不值得和他交友;守道不坚定,阅历事物不广博,辨别是非不清楚的,也不值得和他交游。
Reality is always more fantastic than fiction.
Illustrations should not just decorate the text; they should expand it.
The process of solving a mathematical problem is often more important than the solution itself.