金光明經文句記 3.158

3.158

二、「阿含」下，取相。上明作法，但令三業順於佛制，法成罪滅。尚是散心，罪滅猶淺。今論取相屬於定心，想成相起，滅罪則深。故蛇口想成，豈唯婬罪得除？亦乃欲心不起。

Second, from "Āgama" downward, [treating] obtaining signs. Above, explaining ritual action, it merely causes the three karmas to conform to the Buddha's ordinances, so that once the ritual is completed the offense is eradicated. This is still a distracted mind, so the eradication of offenses is still shallow. Here, discussing obtaining signs pertains to the concentrated mind: when visualization is completed and signs arise, the eradication of offenses is deep. Thus when the visualization of the serpent's mouth is perfected, how could it merely eradicate offenses of sexual misconduct? It also causes lustful thoughts not to arise.