登山不论遇到什么艰难险阻都不停止脚步，就一定能够登上山顶。

If something is boring after two minutes, try it for four. If still boring, then eight. Then sixteen. Then thirty-two. Eventually one discovers that it is not boring at all.

Sometimes it seems as if there are more solutions than problems. On closer scrutiny, it turns out that many of today's problems are a result of yesterday's solutions.

The most profound discoveries in mathematics often come from the simplest observations.