Paul says that we are awaiting adoption:
23 And not only the creation, but we ourselves, who have the firstfruits of the Spirit, groan inwardly as we wait eagerly for adoption as sons, the redemption of our bodies. -Romans 8:23
John says we already are sons of God:
1 See what kind of love the Father has given to us, that we should be called children of God; and so we are. The reason why the world does not know us is that it did not know him. 2 Beloved, we are God's children now, and what we will be has not yet appeared; but we know that when he appears we shall be like him, because we shall see him as he is. -1 John 3:1-2
So, Okay, sure. The already, but not yet: We are somehow both sons of God and we are also waiting to be adopted as sons.
- But how are we both sons and at the same time waiting to be adopted as sons? How can we wait for adoption as sons if we're already sons? I surely am not waiting around for my earthly parents to adopt me.
- And what is the fundamental reality? Are we truly not sons of God until we've passed through judgment and our bodies are redeemed. Or are we truly already sons of God and the resurrection doesn't much affect that?