大毘盧遮那經供養次第法疏 1.13

1.13

In the fifth section, "Those whose minds are awakened to the wonderful mantra gate" and so forth, regarding "union" (yoga), there are two aspects: first, one contemplates the iṣṭadevatā; when the contemplation of the iṣṭadevatā is fully ripened, one's own body becomes the iṣṭadevatā. When this mind is not distracted, it is called "union". "The wise" refers to one who awakens to the principle of ādy-anutpāda.