Ambrosiaster, on Rom 6:6

“Knowing this, that our old man is crucified with him, that the body of sin may be destroyed, to the end that we may serve sin no longer.”

“Paul underlines and repeats a good deal in order to teach the baptized that they must not sin and above all that they must not return to idolatry, which is a very serious crime and the root of all errors, lest they lose the grace which they have received through Christ. He calls our former behavior "our old self" because, just as the man who has a pure life through Christ and faith in him is said to be new, so the same man is said to be old through unbelief and evil deeds. Paul says that these deeds have been crucified, which means that they are dead, that the body of sin (i.e., all our misdeeds) has been destroyed. Paul calls all our sins a body, which he says has been destroyed by a good life and by orthodox belief.”

Imported from an open dataset — not yet checked against the printed edition.