《庄子·内篇·应帝王》
至人用心犹如明镜，物来不迎，物去不送，物来应照。物去不留，顺应自然，不存私心，所以能够超脱物外而不为外物所害。
至人之用心若镜，不将不逆，应而不藏，故能胜物而不伤。
The mind of the most perfect person is like a bright mirror; he does not welcome the coming or see off the departing, but he responds to what is coming. He does not detain what is departing; he goes with the way of nature; he does not keep any selfish thought; therefore he can transcend material things and will not get afflicted by external things.