《黄帝内经·素问·五常政大论》
黄帝道；有久病的人，气机虽已调顺而身体不得康复，病虽去而形体依然瘦弱，应当怎样处理呢？岐伯说：您所问的真精细啊！要知道天地之气化，是不可用人力来代行的，四时运行的规律，是不可以违反的。若经络已经畅通，血气已经和顺，要恢复正气的不足，使与平常人一样，必须注意保养，协调阴阳，耐心等待天时，谨慎守护真气，不使有所消耗，他的形体就可以壮实，生气就可以长养，这就是圣王的法度。
夫经络以通，血气以从，复其不足，与众齐同，养之和之，静以待时，谨守其气，无使倾移，其形乃彰，生气以长，命曰圣王。
The Yellow Emperor asked: There are people with chronic illnesses. Although their energies have been regulated smoothly, their bodies have not recovered. Although their illnesses have subsided, their physical forms are still thin and weak. What should be done? Qi Bo replied: What you have asked is very subtle! You should know that the transformation of energies in nature and heaven cannot be replaced by human power; the laws of four seasons cannot be violated. If the meridians and collaterals have been unblocked, and qi and blood have flowed smoothly, in order to restore the body’s vitality and make it the same as a healthy person, one must focus on health maintenance, balance yin and yang, wait patiently for the right weather, protect one’s vitality carefully, and avoid consuming it. That way, one’s physical form will become strong, and vitality will grow. This is the way of the sage kings.