 As for changing the bad to the good, it is a matter of nurturing one’s qi well. In time, one’s substance (zhi) is altered accordingly…. This is human ability, which is practice precisely. Thus, qi changes with practice, and nature is realized with practice. Substance is the residence of nature, nature is the regulating of qi, and qi is the substantiation of substance. [Qi] is what practice can control. (Wang QSYS: 7:11a-b) 