Missions is not the ultimate goal of the Church. Worship is. Missions exist because worship doessn’t. The great commission is first to delight yourslef in the Lord (Psalm 37:4). And then to declare, “Let the nations be glad and sing for joy!” (Psalm 67:4). In this way God will be glorified from beginning to end and worship will empower the missionary enterprise till the coming of te Lord.
From the book "Let the Nations be Glad: Supremacy of God in Missions"