A law of nature， lex naturalis， is a precept or general rule found out by reason， by which a man is forbidden to do that which is destructive of his life or takes away the means of preserving the same.

We must not always talk in the market-place of what happens to us in the forest.

人生就是一列开往坟墓的列车，路途上会有很多站，很难有人可以自始至终陪着走完。当陪你的人要下车时，即使不舍也该心存感激，然后挥手道别。