法界次第初門 1.107

1.107

內六根界。此具如前明，內六根入中分別其相，乃更加以界之名義者，欲使修觀之徒推析無謬，不滯十六知見之妄計也。

The six internal sense-faculty dhātus. These are fully as explained previously in distinguishing their characteristics under the six internal sense-faculty āyatanas; the reason we further append the name and meaning of "dhātu" to them is to cause practitioners of contemplation to analyze them without error, so that they do not get stuck in the false reckonings of the sixteen views and notions.