大毘盧遮那成佛經疏 10.80

10.80

以初字為體，以初第一字陀𠻱（二合）為種子。陀是法界義。囉是塵障諸垢之義，若入阿字門即是無塵障，即是法界。當知即同法界故，更於何處而有塵耶？此即大空之義。若人住此三昧，則一切蓋障無不破壞。重說者，極破塵障之義也。故以說無塵三昧，所謂陵字門。次說馹陵（二合）字是三昧，即是諸障不生而得大空生也。此種子字有種種定慧莊嚴，故能於生死中而得自在，坐佛樹下摧破四魔兵眾也。無能勝，即無不可破壞之義也。

Taking the first syllable as the essence, it takes the very first conjunct syllable *dhra* as the bīja. *Dha* has the meaning of dharmadhātu. *Ra* has the meaning of defilements, obstacles, and all dust; if it enters the syllable A gateway, it is without dust or obstacles, which is the dharmadhātu. One should know that because it is identical to the dharmadhātu, where else could there be any dust? This is the meaning of great emptiness. If someone abides in this samādhi, then among all obscuring obstacles none will not be destroyed. Doubling the utterance means utterly breaking dust and obstacles. Hence it is said to be the dustless samādhi, namely the *rīṃ* syllable gateway. Next, saying the conjunct syllable *jrīṃ* is samādhi; that is to say, all obstacles do not arise, and one attains the birth of great emptiness. This bīja syllable possesses various adornments of concentration and wisdom; therefore, one can attain mastery in saṃsāra, and sitting beneath the bodhi tree, crush the four māras' hosts. 'Aparājita' (Invincible) means there is nothing that cannot be broken.