大毘盧遮那成佛神變加持經蓮華胎藏菩提幢標幟普通真言藏廣大成就瑜伽 1.146

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彼真言曰（如來謂息一切障故，住火生三昧，說摧大障者真言。謂行人從初發菩提心守護增長，至令成佛果終不退失，不墮在非道中）阿左羅曩（引）他。

His mantra says (The Tathāgata, in order to pacify all obstacles, abides in the fire-generating samādhi and speaks this mantra that destroys great obstacles. It means that the practitioner, from the initial arousal of the bodhicitta, is guarded and nurtured until the attainment of the fruit of buddhahood without ever backsliding or falling into improper paths): Acalanātha.