大般涅槃經義記 3.310

3.310

上來合竟。「以是因緣無能殺者」結答上問成不可斷。前六段中偏就四段結答上矣。上來迦葉執相徵實難無佛性，如來辯實異相以答。自下迦葉執實徵相難無殺生，如來辯相異實以答。難意如何？若性叵殺應無不善，下佛答之，明相異性故有殺生，以有殺故有不善業。

The above concludes the application of the analogies. "Because of these causes and conditions, no one can kill [it]" concludes the answer to the preceding question, establishing that it cannot be severed. Among the preceding six passages, this concludes the answer to the above particularly with respect to the fourth passage. Above, Kāśyapa grasped at characteristics to scrutinize the real, challenging that there is no buddha-nature; the Tathāgata distinguished the real from characteristics to answer. From here down, Kāśyapa grasps at the real to scrutinize characteristics, challenging that there is no taking of life; the Tathāgata distinguishes characteristics from the real to answer. What is the intention of the challenge? If the nature cannot be killed, there should be no unwholesome [karma]. Below, the Buddha answers, clarifying that because characteristics differ from the nature, taking of life exists; because there is killing, unwholesome karma exists.