He applies his understanding to this verse.
"For while we were still weak, Christ died for the ungodly" (Romans 5:6)
Some commentators write that because an aorist is used here, Romans 5:6 proves that Christ’s death was a once-off event, never to be repeated, and therefore Christ could not be reoffered time and time again in the Roman mass. While not wanting to deny the once-for-all nature of Christ’s death (cf. 1 Peter 3:18), the aorist in Romans 5:6 does not prove the point at all. If we look ahead a few verses, we come to 5:14 (see above), where we see an aorist that plainly depicts death reigning from the time of Adam to Moses. To reiterate, this is not a once-off action. It is not punctiliar.
So all you Hellenophiles of the koine variety, head on over to this blog and be helped further.