为了得到永生，一个人必须付出昂贵的代价；一个人必须在活着的时候死去多次。
One has to pay dearly for immortality；one has to die several times while still alive.
Every villain is the hero of his own story.
In mathematics, the journey of discovery is as important as the destination.
过去是一位老师，如果我们愿意学习的话。