最安全的做法是不违背良心。有了这个秘诀，我们可以享受生活，不害怕死亡。
The safest course is to do nothing against one's conscience.With this secret， we can enjoy life and have no fear from death.
Mental processes are means to ends in the struggle for existence.
永久胜利时见！
当没有人相信你的时候，你必须相信自己。
In mathematics, the journey is just as important as the destination; the process of discovery is where the real learning happens.
We must remember the past in order to better face the future.