維摩經玄疏 1.75

1.75

四、明隨第一義者，即是第一義悉檀。若說四門若事、若理，聞說即悟，皆是第一義悉檀也。故以四隨成四悉檀。

4. Clarifying accommodating the paramārtha: this is the paramārtha siddhānta. If one expounds the four gates, whether phenomena or principle, and upon hearing it expounded they immediately awaken, this is entirely the paramārtha siddhānta. Thus the four accommodations establish the four siddhāntas.