In a great sermon this morning, my brother reflected on Ephesians 3: "His intent was that now, through the church, the manifold wisdom of God should be made known to the rulers and authorities in the heavenly realms, according to his eternal purpose which he accomplished in Christ Jesus our Lord."
In the Old Testament, the construction of a Church across the world was prophesied (e.g. in Malachi: "'My name will be great among the nations, from the rising to the setting of the sun. In every place incense and pure offerings will be brought to my name, because my name will be great among the nations,' says the LORD Almighty."), but the details were a mystery, even to the angels.
Peter says that "Even angels long to look into these things" (1 Peter 1:12).
