法華玄義釋籤 8.9

8.9

似如所問，今云麁者，未見一理而三理乃至一行而三行，乃至六即初後俱三，三一不殊，初後不二，乃至修德性德一念三身等。若如是者方名妙行。

It might seem as you question. However, when we speak of it as 'crude' now, it is because [such a view] has not yet perceived that one principle is three principles, and so on up to one practice being three practices, and so on up to the beginning and end of the six stages of identity being both three, three and one being not different, beginning and end being non-dual, and so on up to cultivated virtues and inherent virtues, and three bodies in a single thought-moment. Only if it is like this may it be called marvelous practice.