大毘盧遮那成佛經疏 10.16

10.16

此真言意云：體於如如，以此自在之力而除一切塵垢之障蓋，證於空也。空中之空，即大空義。此相微細難遣，處處說破無明三昧，淨除自體之惑相，故重言之，纜纜二字又更重言之也。又相釋者，以住（raṃ字故，能為一切眾生作大饒益，發生此性除去眾垢也。）若有眾生入此真言門者，不久即同彼菩薩之德也。凡觀照時，唯以本體一字為主，持誦則具言也。此即是種子之字。又凡諸字次第相釋，如先有惡字，以次字皆轉釋之。准上字門中，不遍不名為普也。

The meaning of this mantra is: embodying suchness, through this sovereign power one removes the coverings of all defiling dusts and realizes emptiness. The emptiness within emptiness is the meaning of great emptiness. This characteristic is subtle and difficult to dispel; throughout it speaks of breaking through the ignorance-samādhi and purifying the characteristics of confusion in one's own essence; therefore it is repeated, and the two syllables raṃ raṃ are repeated once more. Furthermore, explaining the characteristics: by abiding in the syllable raṃ, one can bring great benefit to all sentient beings, bringing forth this nature and removing the defilements. If there are sentient beings who enter this mantra gateway, before long they will equal the virtues of that bodhisattva. Whenever contemplating, one takes only the single syllable of the fundamental essence as primary; when reciting, one speaks them in full. This is the seed syllable (bīja). Furthermore, whenever syllables explain one another in sequence, just as first there is the syllable a, the subsequent syllables turn to explain it. Following the syllable gateways above, that which is not all-pervasive is not called universal.