Groaning in Romans 8

There's nothing like doing all age talks on Romans. I've done Romans 2:17-29, on this coming Sunday I'm doing Romans 8:18-30, and in November I'm doing Romans 11:1-10.
That's one cause for groaning in Romans 8: how do you present it to the full range from 4 to 84 in church?
But I was very encouraged to reconsider the passage, and particularly when Anders Nygren confirmed my reading. The Spirit groans in sympathy with creation and with Christians. His prayer of groaning is acceptable because that is exactly the right thing to pray as we long for the redemption of our bodies, the end of the battle with indwelling sin. Which leads to a striking application: if the Spirit's prayer for us, fully conformed to God's will for us, is to groan with us, then we ought to groan more in prayer. I'm going to groan more: that would suit my situation.
Another thing about the groaning. The groan of creation in 8:22 is sympathetic - check out the Greek. It is not the groans of a mother in childbirth, rather it is the husband alongside, sharing but contributing directly to the process, because of love and the desire to see the revelation of the child. In one sense that matters because it cleans some English translations from the charge of pantheism; but it also points to the labour of God, for it is He who is doing the life-bringing-forth work that creation groans to see the fruit of.