折疑論 1.122

1.122

然以不生之生。而現於有生之生（如來真淨妙體本來無生。因見一切眾生往來六道無有了期。故以示無生之體。化現於有生之類故也）。

Yet through the birth of the unborn, he manifests in the birth of those that have birth (The Tathāgata's true, pure, and wondrous essence is originally unborn. Because he sees all sentient beings transmigrating through the six paths without any end, by demonstrating the essence of the unborn, he manifests transformationally among the kinds that have birth).