While forgiveness is indeed costly, it is not beyond the means of those who have Christ’s life flowing within them. When God tells us to love our enemies, He also gives us the love to go along with the command.
Yes, you can do this… because He can do this….
And so because He has forgiven us — and because of His boundless life which now indwells us — what offense is too great for us to forgive?
— Nancy Leigh DeMoss, Choosing Forgiveness, p. 90-92