Some day it will be impossible to count the people of Israel, because there will be as many of them as there are grains of sand along the seashore. They are now called “Not My People”, but in the future they will be called “Children of the Living God”.
The Spirit makes us sure about what we will be in the future. But now we groan silently, while we wait for God to show that we are his children. This means that our bodies will also be set free.
In certain ways we are weak, but the Spirit is here to help us. For example, when we don't know what to pray for, the Spirit prays for us in ways that cannot be put into words.
We can be proud of our clear conscience. We have always lived honestly and sincerely, especially when we were with you. And we were guided by God's wonderful kindness instead of by the wisdom of this world.
Christ also brought you the truth, which is the good news about how you can be saved. You put your faith in Christ and were given the promised Holy Spirit to show that you belong to God.
Think how much the Father loves us. He loves us so much that he lets us be called his children, as we truly are. But since the people of this world did not know who Christ is, they don't know who we are.
My dear friends, we are already God's children, though what we will be hasn't yet been seen. But we do know that when Christ returns, we will be like him, because we will see him as he truly is.
If we have faith in God's Son, we have believed what God has said. But if we don't believe what God has said about his Son, it is the same as calling God a liar.