金光明經文句記 1.243

1.243

二、「束」下，約事對三業。不殺盜婬，身業也。不妄語，口業也。不飲酒，意業也。持既順性，故立戒因，成佛三業。佛身口意隨智慧行無有過失，名三無失。以無失故不須防護，名三不護。身業現化，名神通輪；口業說法，名正教輪；意業鑑機，名記心輪。三皆摧碾眾生惑業，下地不測，故名三密。

Second, from "binding" onward, matching with the three karmas in terms of phenomenal aspects. Non-killing, non-stealing, and non-unchastity are physical karma. Non-false speech is verbal karma. Non-drinking of alcohol is mental karma. Since upholding accords with the nature, the cause of the precepts is established to consummate the three karmas of a Buddha. The Buddha's body, speech, and mind act in accordance with wisdom without error, which is called the three free-from-faults. Because they are without fault, they require no guarding, which is called the three unguardeds. Manifesting transformations through physical karma is called the wheel of supernatural powers; teaching the Dharma through verbal karma is called the wheel of correct instruction; discerning faculties through mental karma is called the wheel of discerning the mind. All three crush the afflictions and karma of sentient beings, and are unfathomable to the lower stages; hence they are called the three secrets.