To eat bread without hope is still slowly to starve to death.
The process of solving a mathematical problem is often more important than the solution itself.
可持续性不是一种趋势,而是我们对后代的责任。
死者既已安葬,活着的人就不要长久地哭泣,而应该尽快做事,每个人都做自己能做的事,并用来使大家互利。