The design of the institution of the Gospel-ministry [electronic resource] : fidelity in the discharge of it; and the obligation upon the ministers of the Gospel thankfully to acknowlege the power and grace of God towards them. A sermon preach'd on Lord's-Day morning September 27. 1741. At the North Brick Church in Middle-Street, Boston. / By Ellis Gray, A.M. One of the Pastors of that Church