大毘盧遮那成佛經疏 13.15

13.15

阿娑迷者，此明即以阿字為首，即同諸佛法身無相離相，當知此法身是無與等比也。三迷者，謂佛三身謂法、報、化合為一身，教化眾生也。亦體同阿字之門，無相離相，故言等也。三昧耶者，是不可越義。是無等三等，諸如來之所同說也。佛住三昧，說此明無害無等力，由此明故能入三昧耶。此三昧耶即是誓願，猶如於勅，是三世佛本所要誓也。此法門難信難入難得聽聞，由法不可遇故也。以是故三世佛同說此真言，以此三昧耶真言加被，得入聽聞修行此法也。如尊之教不可違越，若不聞者，即不得入亦不得聽聞也。娑訶是警發義也，以此真言警發諸佛。說此明時，諸佛即警發而起，加持行人也。此明力故能滿諸地，能令修者得現三法。謂成就有三法，謂本尊之力、真言及印，此三法界即得成就也。

Asame: this vidyā takes the syllable A as its head, which is identical to the buddhas' dharmakāya being markless and free from marks; one should know that this dharmakāya has nothing equal or comparable to it. Same: this refers to the three bodies of the buddha—namely the dharma, reward, and transformation bodies—uniting as one body to teach and transform sentient beings. Its essence is also identical to the syllable A gateway, markless and free from marks; hence it is called equal. Samaye: this has the sense of being inviolable. It is the unequalled and the three equalities, expounded in common by all tathāgatas. The Buddha dwelt in samādhi and expounded this vidyā of unassailable and unequalled power; through this vidyā, one is able to enter the samaya. This samaya is a vow, like an edict; it is the fundamental solemn pledge of the buddhas of the three times. This Dharma gateway is difficult to believe, difficult to enter, and difficult to get to hear, because the Dharma is impossible to encounter [lightly]. For this reason, the buddhas of the three times expounded this mantra in common; empowered by this samaya mantra, one is able to enter, hear, and practice this Dharma. Just as the Honoured One's instruction cannot be transgressed, if one has not heard it, one can neither enter nor hear [the Dharma]. Svāhā has the sense of alerting and arousing; with this mantra, one alerts and arouses all buddhas. When this vidyā is spoken, all buddhas are alerted, arise, and grant adhiṣṭhāna to the practitioner. Through the power of this vidyā, one can fulfill all bhūmis and cause the practitioner to manifest the three dharmas. That is, accomplishment has three dharmas: the power of the fundamental deity, the mantra, and the mudrā; these three dharmadhātus are thereupon accomplished.