The author of the article asks whether it is a sin to not forgive and shows one biblical pattern that would seem to suggest it's not a sin to not forgive,
if the person is not repentant
"Christ lays out the pattern as “sin, rebuke, repentance, forgiveness.” The forgiveness doesn’t come before the repentance. Now, there is a valid counter-position that models the process as forgiveness first and then a reconciliation once the person asks forgiveness. Fair enough. We’re not trying to stake an absolute claim here. We’re exploring whether there’s a case – a case – for Trump’s unforgiveness to co-exist with a faith in Christ..."
