大毘盧遮那經供養次第法疏 2.20

2.20

Fifth, the section on the Samaya Mantra contains verses for mudrās and mantras. "The vidyās" means the iṣṭadevatā. In the sixth passage there are verses and mantras. First, regarding "adorned and prepared": by means of Ākāśagarbha's transforming vidyā and mudrā, with various perfumes, flowers, the five grains, and the five medicines, one mentally produces adornments and preparations. The manifest external preparation is understood. "With the root mantra and mudrā" means the mudrā and mantra of the honoured Acala. Section on the Arghya Mantra. In the meaning of the phrase above, GAGANA means space; SAMA means equal; ASAMA means unequalled; that is, "equal to space and unequalled". Because the Tathāgata's Dharmakāya is inherently pure, without conceptual discrimination, and without boundaries, it is equal to space. Yet it also possesses immeasurable, boundless, inconceivable virtues, which cannot be analogized even by space; hence it says "unequalled". Furthermore, ASAMA means unequal; the unequal ones are the two vehicles. Now, since it is both equal to space and equal to this unequalled, it says "equal to space and unequalled". This initial syllable GA is the essence of the mantra; within the realm of sentient beings the characteristics of coming and going are ungraspable, and within the dharmadhātu the characteristics of coming and going are also ungraspable; because the Tathāgata's "thus coming" and "thus going" are ungraspable, it is called the great emptiness. Using this water that is inherently pure in great emptiness to bathe the stainless body: this is the true word (mantra) of arghya.