Subdue the demons by first subduing your own heart; tame the hostility by first calming this energy. The demon subduer must first subdue their own heart; when the heart is subdued, all demons retreat and listen; the tamer of hostility must first tame this energy; when the energy is calm, external hostility cannot invade. --- "Cai Gen Tan"

[Main Idea] To conquer evil, one must first conquer the evil within oneself. Once the evil within is subdued, all other evils will naturally lose their effect. To control unreasonable adversities, one must first control their easily swayed emotions, so that all external adversities will naturally not intrude.