The chief purpose of the church is to bring glory to God by accomplishing the Great Commission pronounced by Jesus. Everything else—worship, preaching, teaching, discipling, congregational care, the sacraments, feeding the hungry, caring for the poor, and so on—while valuable for us and pleasing to God in and of themselves, are ultimately means to the end of faithfully completing the assignment given to the church by Jesus just before he left.
Richard Stearns (2013). Unfinished: Filling the Hole in Our Gospel
By the way... 