
Keep sincere, silent and gentle and have your mind in zhentu [ dong (ignorance) and jing (stillness)]. Nourish your qi and make it strong and potent, without too much concentration or neglect. With huijian (the use of willpower) in zhentu, all diseases will vanish from your body.

Zhentu is the original willpower. To keep fit through qigong, you are required to cultivate the mind seriously. Qi comes from willpower, just as plants imbibe nourishment from their roots in the earth. When the soil is good, the plants will flourish. And only when you have a noble character, will you be able to make progress in qigong practice, and re-duce or even eliminate various worldly burdens.
Take substances for medicine and you will cure your body of diseases, and take exercises {or medicine and you will regulate your mental activity. To get rid of diseases and regulate mental activity, you have to look into your own mind.