大毘盧遮那經供養次第法疏 1.38

1.38

「為令彼堅固」以下，第十二金剛薩埵真言門，是堅固法之身也，又有印真言及頌也。令彼堅固者，欲令依法界生修行者堅固其身心也。觀自金剛身者，同於金剛薩埵身也。「結金剛智印」以下二行偈，明所作印。「是人當不久」等二句，以現作印之益也。「真言印」等，二句，顯救世者所見之相也。「常如寶輪轉」等二句，於救世者所見中，舉事寶輪況法寶輪也。

From "In order to make them firm" onward is the twelfth gate, the Vajrasattva Mantra, which solidifies the body of Dharma; here also are mudrā, mantra, and verse. "Making them firm" means wishing to solidify the body and mind of the practitioner who cultivates relying upon the Dharmadhātu-Origination. "Contemplating one's own vajra body" means being identical with the body of Vajrasattva. The two gāthā lines from "Binding the vajra-wisdom mudrā" onward explain the mudrā to be performed. The two lines "That person shall not long [after]", etc., manifest the benefit of performing the mudrā. The two lines "Mantra mudrā", etc., reveal the characteristics seen by the Savior of the World. The two lines "Constantly turning like a precious wheel", etc., within what is seen by the Savior of the World, cite the phenomenal precious wheel as an analogy for the Dharma precious wheel.