"Nourishing Life" (Yang Sheng Zhu) is Zhuangzi's third chapter on health and living in harmony.
Cook Ding butchered an ox with movements like a dance. His knife had been used 19 years and still looked new. Why? "I follow the natural patterns" — slipping the blade through natural gaps, never cutting through bone or tendon.
Cook Ding's knife avoided knots and found gaps. So in life — don't force, don't burn out. Work with the natural rhythm. When facing hard problems, find the "grain" rather than pushing through.