The whole of life is an act of letting go, but what hurts the most is not taking a moment to say goodbye.
解释:在人活动范围内的水就污浊,在野外无人地方的水就清洁。同为一样的水,都是从天边开源,有的混浊有的清洁,这是它们所处环境使它们这样的。
It is always good to have a problem that you cannot solve. It means you have something to work on.