The divine institution of preaching the Gospel, considered : the nature and quality of the Gospel mission, opened and illustrated; and the necessity of an investiture with office power, by ordination, in order to the preaching of the Gospel according to divine institution, evidenced and improved, : in a sermon, preached at Brook-Haven, on Long-Island, June 15, 1758. Previous to the ordination of the Rev. Mr. Abner Brush. /