淨名玄論 1.58

1.58

今次釋入門不二之理。稱門凡有五義：一者至妙虛通常體為門；二欲簡別餘法門戶各異，今是不二法門，非餘門也；三欲引物悟入故稱為門；四通生觀智所以為門；五因理通教故名為門。此四皆從他受稱也。

Next, we explain the principle of entering the gate of nonduality. Speaking of a "gate," there are five meanings: First, the most wondrous, empty, and pervasive identical essence constitutes the gate; second, to distinguish it from other dharmas whose portals are distinct, this is the Dharma gate of nonduality and not any other gate; third, to guide beings into awakening, it is termed a gate; fourth, pervading and generating the cognition of contemplation, it constitutes a gate; fifth, because the principle gives access to the teaching, it is named a gate. These [latter] four all receive their names from another.