淨名玄論 3.40

3.40

後、釋法門，即不思議可軌名法，法有虛通故名為門。又法有無量門，今是不思議門也。又正道未曾思議與不思議，今云不思議者，是通道之門耳也。

Next, explaining "Dharma gate": that which is inconceivable and serves as a model is called "Dharma"; because Dharma possesses unobstructed passage, it is called a "gate". Moreover, the Dharma has immeasurable gates, and this is the gate of the inconceivable. Furthermore, the correct path has never been either conceivable or inconceivable; stating "inconceivable" here is merely the gate that leads into the path.