大毘盧遮那成佛經疏 10.7

10.7

此意言：等者即是諸法畢竟平等也，進者是逝義，謂佛善逝而成正覺。然此平等法界無行無到，云何有來去耶？次即釋言：以能離垢除一切障，即是勝進之義。無行而進最為善逝也。以如是進行能成法生，即是從平等法性而生佛家也。故次言大中之大，即等等無礙證中大空，大空者佛境界也。然此真言以訶字為體，訶者喜也，所謂修行菩薩修也。若眾生從此法門而受持讀誦或觀照者，即同普賢之門，不久能得佛境界莊嚴三昧自在之力。

The meaning here is: "Equal" means the ultimate equality of all dharmas. "Advancing" has the meaning of "gone," referring to the Buddha being the Sugata who realized correct awakening. Yet in this equal dharmadhātu there is no walking and no arriving; how could there be coming or going? Next it explains: because he can leave defilement and remove all obstacles, that is the meaning of superior advancement. Advancing without walking is the foremost Sugata. Through such advancement, one is able to accomplish the birth of dharma, which means being born into the Buddha's family from the equal dharmatā. Therefore it next says, "the greatest among the great," which is the great emptiness within the equal and unimpeded realization; great emptiness is the Buddha's realm. Furthermore, this mantra takes the syllable HA as its essence. HA means joy, which refers to the cultivation of the practicing bodhisattva. If sentient beings uphold, recite, or contemplate through this Dharma gateway, they will become equal to the gateway of Samantabhadra, and before long will attain the sovereign power of the samādhi of the realm of the Buddha's adornments.