法華玄論 1.73

1.73

Furthermore, wishing to preach the fundamental wheel of the Dharma, he preached this sūtra. As for the fundamental wheel of the Dharma: when the buddhas of the three times appear in the world for the sake of the one great causal condition, they preach the path of the one vehicle. However, because capacities and conditions were not yet capable, he preached three within the one, taking the one vehicle as the root and the teachings of the three vehicles as the branches. But when the great conditions had matured and beings were capable of receiving the one vehicle, wishing now to return to preaching the fundamental wheel of the Dharma, he preached this sūtra.