There are many good good reasons why God might choose to build his church.
On the one hand, his church as it gathers on earth is a really useful place to help encourage Christians to keep trusting in the promises of God, especially as we go through the normal challenges of life.
But on another hand, his church is a powerful testimony to everyone and everything in the universe of the truth and the power of the love of God, as he brings together the divided world under the one lordship of Christ.
It is this second reason that the letter to the Ephesians so powerfully expresses, and it is this central function of the building of the church that will form the heart of our talks this Sunday.
God is building a masterpiece as he builds his church, and it is the undeserved pleasure of the believers in Christ to be made a part of this awesome project.