大毘盧遮那成佛經疏 9.73

9.73

右句義中，伐折囉入嚩羅是金剛光，微薩普羅是普遍義。言此金剛智光普遍一切，能除生死暗障，亦能映奪之者，則是如來甲義也。此真言以最後𤙖字為體，具足三解脫門。謂上有曩字空點是大空義，即是空解脫門。本體是訶字，離因緣故，即是無相解脫門。下有鄔字三昧畫，以本不生故，即是無作解脫門。如是三門，一切諸障所不能入。以此慧光遍嚴身故，名為如來甲也。撿密印，其中梵本似有殘缺，疑此是金剛薩埵圓光真言，更當訪餘梵本。

In the meaning of the phrases above: vajrajvāla means vajra-blaze; visphura means pervasive. It means that this vajra-wisdom radiance pervades all, able to eliminate the dark hindrances of saṃsāra and also eclipse them; this is the meaning of the Tathāgata's armor. This mantra takes the final syllable hūṃ as its essence, fully endowed with the three gates of liberation. That is to say, the bindu representing the syllable na above is the meaning of the great emptiness, which is the emptiness gate of liberation. Its basic body is the syllable ha, which, being free from causes and conditions, is the signless gate of liberation. Below it has the stroke for the samādhi of the vowel u, which, being unborn, is the wishless gate of liberation. These three gates cannot be entered by any hindrances. Because this light of wisdom adorns the body throughout, it is called the Tathāgata's armor. Examining the secret seal, the Sanskrit text there seems to have a lacuna; I suspect this is the mantra for the halo of Vajrasattva, and further Sanskrit manuscripts should be consulted.