There is always the question asked whether it is appropriate to forgive a person if they just keep going back doing the sinful things against you making their repentance almost as usury. I think of the troubles I've seen with addicts and compulsive liars/thieves. Jesus says yes. That doesn't mean that you have to hand them the knife with which they'll stab you in the back. By all means protect yourself and your possessions. Limit their opportunity. The forgiveness is as much for your sake as it is for theirs. A great many are suddenly controlled by both their lack of unforgiveness and feelings of violation.
The child abuser or molester certainly knows his fate. Why is it then that they continue? One could ask that of the whole host of sins. Escaping our sinful destructive natures is never so much a rational deductive decision. We like to see the nature separate from the person, a steal trap tight into the bone of the rabbit's hind leg; if he pulled hard enough or if we opened the claws he could pull his leg out. It may well be instead that the nature is the rabbit's and the trap was set by the good master to protect his crops.
God gives us our faith and He increases it. By this faith we could move a tree far from it's nest but, in the end we had only done as He commanded. Where of then can we boast or take leave of duty. We are yet unprofitable servants. "Prosperity" and "God Within" teachers should be ware. Paul later combines this type teaching, faith as to move mountains but having not love for one another as being futile.
There are two things the Lord is revealing here to keep separated I believe, the Kingdom of God and the Day of the Lord. The kingdom is within us. It is unseen by eye. It is not a place as we would know the word place. It is at hand. The Day is coming, only the Father knows when, as a thief in the night, the five bridesmaid lamps run out of oil, Daniel Ezekiel and Revelations end of the world kind of stuff. The Pharisees were so wrapped up in the notion that the Kingdom was earthly, that the Messiah was going to establish the earthly Kingdom first and upon doing that His Day would come. How then could two people be working in the field together and one be snatched away to the Kingdom? No the Kingdom is spiritual, the Day is day of final judgment, then there will be a millennium of earthly rule, then there will be an eternity in the new earth/heaven/Jerusalem.