预测未来的最好方法是创造未来。

The most important thing in mathematics is to ask the right questions.

The world is full of people who have never, since childhood, met an open doorway with an open heart.

死亡不算什么，但每天生活在失败和没有荣耀中就是每天都在死去。

可持续性不是一种选择，而是我们对后代的责任。