The sages of the past taught the next, they are called the evil wind, avoid the time, calm and emptiness, the true energy from it, the spirit within the guard, the disease is safe from. So the will is idle and less desire, the heart is peaceful and not afraid, the form is laborious and not tired, the qi is from to obey, each from its desire, all get what they want. Therefore, the beauty of its food, its clothing, enjoy its customs, high and low do not adore each other, its people are called simple. Therefore, the people are called simple. Therefore, lust cannot strain their eyes, lust cannot confuse their hearts, and the foolish, wise, virtuous and unworthy are not afraid of things, so they are in line with the Way. So can all the years of a hundred years old and the movement does not decline, in order to its virtue is not dangerous. The basic principle of health care, the external environment to “avoid the evil wind, avoid the time”, the human body itself to “calm and void, the true energy from it, the spirit within the guard”. The external evil wind is a pathogenic factor, which varies from time to time and from place to place; the emotional disorder and excessive labor are pathogenic factors of internal injury, which varies from person to person. Therefore, external attention should be paid to avoid the invasion of external evil, and internal attention should be paid to the regulation of the spirit, so as to maintain the fullness of true qi, so that no disease can occur. Note: “tranquility” refers to the tranquility of a person’s character; tranquility and indifference.