In John 8, we read that Jesus did not condemn the woman caught in adultery; he just asked her not to sin any more. Elsewhere in the Gospels, Jesus taught how we should always forgive others and love even our enemies. God's mercy is indeed infinite. I see that the Lord does not condemn us either because he continues to wait for us to repent so that he may forgive us. If we do not repent to the end, we simply get ourselves condemned. Seeing such great mercy, we must not mistreat anyone again. Taking revenge is even more out of the question.