What does that mean? Christ in us, just the same as we are in a church building? No, we are in the building, but we can go out of it again. I live in a house, but I can leave that house and go elsewhere. The church building and the house and I are not vitally, organically connected. But, the Lord Jesus came to be part of those disciples and fill their hearts and thoughts and affections; what Peter and James and John had when they had Christ alongside of them, you and I have in a much larger measure, if we have the living Christ within us.