大方廣佛華嚴經疏 6.22

6.22

六普門者，一門攝一切門名為普門，隨一一門各全收法界故。於其中觀察法界，深智契達，故名為入。此於隨相中得解脫。

In the sixth, "universal approach," one approach encompassing all approaches is called a "universal approach," because in accordance with each and every approach, the dharmadhātu is fully gathered. Contemplating the dharmadhātu within it, profound wisdom aligns with and penetrates it; hence it is called "entering." This attains liberation from [the obstacle of] following after marks.