Dante's Purgatory is good for that as well. The argument as I understand it is that God wants us all in, but isn't going to force us, so in effect we choose hell ourselves. Saints are the ones who recognise that God really does want us and take him at his word. Purgatory is inside the pearly gates and is somewhere for us to sort ourselves out because we don't feel worth being in heaven, not because God doesn't want us.