《伤寒论·平脉法》
脉搏太过是病态，不及也是病态。总之，邪气不是空无所见的，如果穷究其源，必能找到病变根本。因此，必须审查病在表在里，分辨在上焦、中焦、还是下焦，明确邪气所侵犯的部位，诊查推断脏腑的盛衰。
太过可怪，不及亦然，邪不空见，中必有奸，审察表里，三焦别焉，知其所舍，消息诊看，料度府藏，独见若神。
An excessively rapid pulse is pathological, and an insufficiently rapid pulse is also pathological. In short, pathogenic qi is not something that is non-existent. If one thoroughly investigates the source, one will certainly be able to find the root cause of the disease. Therefore, it is necessary to investigate whether the disease is on the surface of the body or inside the body, whether it is in the upper, middle, or lower jiao, determine where the pathogenic qi has invaded, and examine and diagnose the strength and weakness of the zang-fu organs.