大毘盧遮那成佛經疏 9.63

9.63

右句義中，怛他揭多是如來，喇旨是焰明。次云薩叵囉儜是普遍，阿嚩婆娑娜是諸暗，伽伽猱陀哩耶是無限量等虛空。意言如來焰光普遍諸暗，等同虛空無有限量也。此真言以句初多字為體，如於心之實相，即是毘盧遮那大智明，普照世間無所不遍。言諸暗者即是無明，以無明本不生故體即是明，是故如來光明普遍諸暗。言等虛空者，以無明等虛空無量故，如來智光亦等虛空無量。乃至老死如虛空無量故，如來智光亦如虛空無量。如十二因緣者，一切諸法亦如是說。如是決定義故，名為燈明真言。以此加持燈明而供養佛，即是諸供中最也。

In the meaning of the phrase above: 'tathāgata' is the Tathāgata; 'arci' is the radiant flame. Next, 'spharaṇa' is pervasive; 'avabhāsana' is all darknesses; 'gaganodārya' is boundless, equal to space. The meaning is that the Tathāgata's flame of light pervades all darknesses, equal to space without limit. This mantra takes the initial syllable TA of the phrase as its substance: like the dharmatā of the mind, it is Vairocana's great wisdom light, universally illuminating the world, leaving nowhere unreached. 'All darknesses' refers to ignorance (avidyā); because ignorance is originally unborn, its substance is light itself; therefore, the Tathāgata's radiance pervades all darknesses. 'Equal to space' means: because ignorance is boundless like space, the Tathāgata's wisdom light is also boundless like space. Up to old age and death being boundless like space, the Tathāgata's wisdom light is also boundless like space. As with the twelve links of dependent origination, so it is said of all dharmas. Because of such definitive meaning, it is called the lamp-flame mantra. Empowering lamps with this to offer to the Buddha is the foremost among all offerings.