妙法蓮華經玄義 9.55

9.55

Regarding the crude and subtle of the four gates of the shared [teaching]: the shared principle is only one; being one, it is ineffable, so how could there be any comparison of crude and subtle to discuss? In terms of expounding gates to respond to capacities, there are indeed superior and inferior; judging the depth of the four gates is as spoken in the Tripiṭaka. Furthermore, in reference to each single gate: if the teaching accords with the capacities of the four siddhāntas, it is called subtle; if it goes against the four capacities, it is called crude. If one cultivates the ten contemplations in each single gate and finds the proper place in every phrase, it is called subtle; if one loses the proper place in every phrase, it is called crude. Because it is crude, it is burned by fires on all four sides and cannot enter the cool pool; that which differs from this is called subtle.