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The source of this sentence is Ge's "China Ancient Customs and Etiquette", which is a standard of good behavior and posture of ancient people. "Later generations advocate sitting and walking, and all gestures should be measured. Stand like a pine and cypress, sit like a bell, walk like the wind, and lie like a bow.' This requires that' the mind will always be solemn, the body will always be purged, the mind will always be self-disciplined, the voice will always be calm, and the temper will always be so polite, so the face will be serious, the face will be clear, the face will be like a mountain, and integrity will be fully reflected. "