大毘盧遮那成佛經疏 9.76

9.76

In the meaning of the phrases above: jvāla means blazing light; mālin means garland. Because the flames form a garland circling unbroken, it is called the Tathāgata's halo. The next phrase says tathāgata-arci, which means the Tathāgata's brilliant light; this is a clear and bright light. In Sanskrit its name is different from the light of the garland of flames; it specifically uses this syllable rci as the essence of the mantra. The r-sound above is the meaning of defiling dust; the ca-syllable body below is the meaning of flux and change. Because it enters the gateway of the syllable a, it is fundamentally free from defiling dust and free from flux; this is the Tathāgata's constantly tranquil light. It also carries the samādhi sound of the vowel i, meaning that this constantly tranquil light is fully endowed with concentration and wisdom; therefore it is tranquil yet constantly illuminates, and illuminates yet is constantly tranquil. Because the ācārya uses this to empower his body, all the gods and spirits see the Tathāgata's garland of flames pervading his form, fierce and difficult to gaze upon like the disk of the sun; therefore, those who cause obstacles cannot gain any advantage.