瑜伽論記 20.220

20.220

初問答中，言最勝子者，佛是最勝，明彼菩薩是最勝之子名最勝子，舊云佛子，答意佛為眾生假說有為無為，而無隨名，有為無為真實法體，故言無二，答言一切法有二，一者有為二者無為者，開二門也，是中有為非有為非無為無為亦非無為非有為，此初答也。

In the first question and answer, regarding 'Supreme Son': the Buddha is the most supreme; explaining that that bodhisattva is the son of the most supreme, he is called 'Supreme Son'—anciently termed 'Son of the Buddha.' The intention of the answer is that the Buddha conventionally posits the conditioned and unconditioned for living beings, but there is no real entity of the conditioned or unconditioned that conforms to the names; therefore it says 'non-dual.' The answer stating 'All phenomena are of two kinds: first, conditioned; second, unconditioned' opens two gates. 'Among them, the conditioned is neither conditioned nor unconditioned, and the unconditioned is also neither unconditioned nor conditioned'—this is the first answer.