There are many metaphors used to speak of our relationship with God, and what Jesus has done for us in his death and resurrection. But I am going to make a statement which is not fully thought out or researched, but intuitively seems right. All of these metaphors (e.g. beatific vision, messianic banquet, forgiveness of sins, etc) are summed up in the metaphor of union with God. I realise that this is using one of the metaphors as the metaphor, but it seems to me that this metaphor takes us directly to the underlying consistency of the Christian gospel. Our end is to be united with God, and we see this end in Jesus. All the other metaphors fall under the power and meaning of what this metaphor refers to: our deep and abiding union with God through Christ and the Spirit. The forgiveness of sins is a good example. An absolute ton has been written about the forgiveness of sins, and some Christians make it the determining metaphor for Christ's work of salvation. There is nothing wrong with this as long as we realise that 'forgiveness of sins' is about union: sin prevents our union with God; forgiveness of sins makes union possible.
The doctrines of the Incarnation and the Trinity teach us this. They are, if you like, the abbreviations of the whole Christian schema. They direct our theology as the spectacles through which we read the rest of our experience, and guide us in our interpretation of Scripture. Both doctrines are about union: the union of humanity and divinity in Jesus, and the union of love of Father and Son in the power of the Spirit within the Trinity. Some metaphors have a natural affinity with this abiding vision of God, others need its correction. Forensic metaphors (like judge) are useful, but need to be kept in contact with the union of love we call the Holy Trinity.
