The yin and yang can be regulated, since we know the seven impaired eight beneficial; if we don’t know it, premature senility may come. At forty, the yin qi is reduced by half, and the constitution becomes debilitated. At fifty, the body becomes heavy, and the hearing and sight are no longer sharp and clear. At sixty, impotence occurs, the qi becomes greatly weak, and the nine orifices become impeded. The yang qi is vacuous at the lower part of the body, and the yin qi is excess at the upper part of the body, so the nose is runny and the eyes are watery. So we say: one who knows this will be strong; one who does not will be senile.
Therefore, the sages do nothing, lead placid, austere and optimistic lives; they can live to a great age, as same as the life with heaven and earth. This is how the sages build their bodies.
Key words: topic on correspondences and manifestations, Yin and Yang, the plain questions
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