大毘盧遮那成佛經疏 10.71

10.71

然此真言，初薩字為體。娑者是漏義亦是堅義，入阿字門即無漏無堅。若有堅牢，即是生滅壞破之法。若令同於阿字，此堅本來不生，即是諸法之中而得自在等於虛空，能為一切寶洲也。私謂釋迦以大悲力，於周體密緻猶如金剛一闡底等，亦令破壞此見而入佛法，施其大寶之願。豈非於諸法中而得自在，能破一切堅牢也。

Now for this mantra, the initial syllable *sa* is the essence. *Sa* has the meaning of outflow (āsrava) and also the meaning of solidity. Entering the syllable A gateway, it is without outflow and without solidity. If there is solidity, it is a dharma of arising, ceasing, and disintegration. If it is made identical to the syllable A, this solidity is originally unborn; that is to say, attaining mastery among all dharmas equal to empty space, being able to act as an isle of all treasures. In my personal opinion, Śākyamuni, through the power of mahākaruṇā, even for icchantikas and the like whose bodies are entirely tight-knit like vajra, also causes them to break through this view and enter the Buddha Dharma, fulfilling his vow of bestowing the great jewel. Is this not attaining mastery among all dharmas, able to break through all solidity?