God IN the story

I've been struck recently on the amazingness of 'God IN the story'. That it makes no sense at all to talk about God being 'unchanging' - partly because of the compassion issue - but primarily because of the incarnation. God is not so 'outside' time to the extent that it makes nonsense of the fact that at a particular time in history he changed in his very being... humanity has been 'added' to God (thus says the orthodox doctrine of the Trinity!). Yes, God's character has not changed, but fundamentally something has been added to his very being and importantly this has happened IN history. Wow!