I must have an attitude of forgiveness towards those who sin against me because:
#1 – If I have been forgiven (when I repented) then I need to forgive those who have sinned against me when they have repented (v.23-27)
#2 – If I refuse to forgive those (who have repented) then an attitude of unforgiveness will take over my heart (v.28-31)
#3 – If I refuse to forgive those (who have repented), God will refuse to forgive me (v.31-35)