To be completely accurate, they are not the core messages of these Gospel texts that you wish to present. However, they do tie in into the Church’s understanding, particularly of the sacrament of Reconciliation.

The Jewish process of forgiveness involved sin - repentance - forgiveness (up to a point limited in numbers).

Jesus took this process and (1) made forgiveness effective; He really could forgive sins and gave that power to his Church; (2) made forgiveness infinite.