I am the son of a church pianist. My mother often played the piano and later the organ for congregational worship. She could pick up any hymn book and artfully play any song. It was one of the last skills she lost, which speaks to how deeply it was ingrained in her.
Growing up, it was not even a question that I would learn to play. In elementary school, I started lessons learning music and plinking out basic tunes. But I never really absorbed it. One big reason was that I hated rehearsing. It seemed like mindless, tedious hours to sit behind those keys when the freedom of my bike and the adventures outside were just beyond the door. So later, when I ‘graduated’ to the trombone, I lost most of what I'd gained on the piano.
I fear that many Christians are like me. We are introduced to the gospel when we come to faith. We understand and believe. But we think that rehearsal of it is tiring and boring. We may wander into other associated pursuits of theology or apologetics. But often, we lose the pure, simple amazement at the gospel.
Paul didn’t want that to happen. To that end, he spends the opening of his letter rehearsing the blessing we have received in salvation. He does this because he knows that when we understand, treasure, and rehearse these truths, they will transform us, our relationships, and our mission.
...making known to us the mystery of his will, according to his purpose, which he set forth in Christ as a plan for the fullness of time, to unite all things in him, things in heaven and things on earth.
- Ephesians 1:9-10 (ESV)