大毘盧遮那成佛經疏 3.4

3.4

經云「若如實知我，當得身無畏」者，如修循身觀時，見此身三十六物之所集成，五種不淨惡露充滿，終不為此而生貪愛。次復觀受心法，得離不觀我性四種顛倒，於身諸扼縛得蘇息處。若真言行者，本尊三昧眾相現前時，位與此齊也。

The sūtra says: 'If one knows the self as it truly is, one shall attain fearlessness regarding the body.' This means that when cultivating mindfulness of the body, seeing that this body is composed of thirty-six elements and filled with five kinds of impurities and filth, one never generates craving and attachment on its account. Next, one further contemplates feelings, mind, and dharmas, attaining freedom from the four inversions of not contemplating the nature of the self, and attains a place of respite from the choking bonds of the body. For a mantra practitioner, when the various marks of the samādhi of the deity appear before them, their station is equivalent to this.