lovemuffin
τὸν ἄρτον τοῦ ἔρωτος
Here Jesus is saying he wants all to be one with he and the father.This obviously does not mean literally.It speaks of a spiritual union.Notice too that the holy spirit is never mentioned in this union.
I'm not sure I'd use the word "literally" but it I do read this (and other related passages) as expressing an actual reality and not just a metaphor. The very word "union" implies a reality beyond a metaphor, and I think it would be difficult to give a plausible account of Paul's extensive use of this kind of language as being entirely metaphorical in his understanding. A good example would be when he says that we are the temple of God. The temple is where God especially dwelt (not to exclude God being present everywhere), not in metaphor but in actuality, according to the stories.