大方廣圓覺修多羅了義經略疏 2.571

2.571

Cook Ding was a butcher in the Jin era who dismembered oxen with a single blade for nineteen years without damaging its cutting edge. This is an analogy for the bodhisattva benefiting sentient beings, cultivating the myriad practices, and responding to conditions by entering the secular world while his own wisdom remains undamaged. The remaining meanings have already been explained above.