It would be interesting to look at the remaining gospels in the same light as Simeons prophecy, the revealing of many a heart. To watch how the heart minimizes and compartmentalizes and justifies and schemes.
Joseph may not have lived to see the Jesus we've come to know. He is not spoken of after this event in Jesus' 12th year. Thus the Simeon prophecy of Mary's heart later being pierced at the crucifiction takes on an interesting light of completion.
Not sure if this discourse amongst the Disciples is given full justice by the text. I imagine this to have occurred much more organically over the course of the evening than presented. If our own dinner conversations where condensed down to two sentences, we'd look pretty foolish as well. What we are told is simply what we most need to know. Surely there was much discussed that night, all with sincere and honest and devoted intentions; just as much as that not discussed and reserved in fear and uncertainty. In other words, they were being human. It must have been a painfully haunting and surreal meal for Judas.
It occurs to me that throughout the kings the high priests are pretty much silent. We see an occasional prophet, but, what about the general day to day counsel and influence of the church. This is not to say that they weren't there, it is to say that there is little mention of their role and position in these national matters.
Healing in the larger passage context more likely refers to the soul's restoration back to God, the removing of enmity. Healing of the broken hearted for instance is not so much a healing of the physical heart/arteries. Healing of the nations is not so much a physical healing of diseased people within those nations. Restoration (healing in this case) surely has more to do with proximity or position or good standing; the returning to the Bishop of our souls.