妙法蓮華經玄義 9.50

9.50

通教亦如是，逗緣別說故為四；同是佛教，故言一。觀法不同故有四；俱向無生故為一。所隨於能故為四；能隨於所故為一。通教即事而真，文字中有菩提，善惡俱觀皆不可得，即是並行，不約此義論狹小，但教觀取真理難當，故名理為狹小（云云）。

The shared teaching is also like this: spoken distinctly to suit conditions, it is therefore four; being equally the Buddha's teaching, it is therefore called one. Because the methods of contemplation are different, there are four; because they all head toward non-arising, they are one. The facilitated follows the facilitating, therefore it is four; the facilitating follows the facilitated, therefore it is one. In the shared teaching, phenomena are immediately the true, there is bodhi within words, and contemplating both good and evil finds that both are ungraspable—this is walking side by side, so narrowness and smallness are not discussed in terms of this meaning; it is only because it is difficult for the teaching and contemplation to match the true principle that the principle is called narrow and small (and so on).