Missions is not the ultimate goal of the church. Worship is. Missions exists because worship doesn’t. The Great Commission is first to “delight yourself in the Lord” (Ps. 37:4) and then to declare, “Let the nations be glad and sing for joy” (Ps. 67:4). In this way, God will be glorified from beginning to end, and worship will empower the missionary enterprise until the coming of the Lord.
John Piper, Let the Nations Be Glad!, p. 17