Train people well enough so they can leave, treat them well enough so they don't want to.
关于爱情最悲哀的事情不仅是它不能永远持续,而且心碎很快就会被遗忘。
The blood in the animal body is impelled in a circle, and is in a state of ceaseless motion.
大道从虚无中产生一气,又从一气中分化出阴阳。