I am thinking that God's mercy has to be infinite. If it is finite, then who can get to heaven? Where do you draw the line? It just does not work out. The God of Christ will forgive us an unlimited number of times as long as we repent. You may picture that the door of mercy is always open. When we sin, we disable ourselves and can't get to the door anymore. Then we repent and we are healed and can get going again. Basically, God wants to get all of us into heaven. With such mercy, you'll have to turn away from him and choose not to repent to get yourself condemned. Sadly, there are too many doing just that.