The duty and advantage of religious societies, proven from Scripture and reason: with proper directions to all who either are or may be engaged in such societies. In two letters; one from the Reverend Mr. John Willison, Minister of the Gospel at Dundee, and the other from the Reverend Mr John Bonar, Minister of the Gospel at Torphichen; Both directed to a private Society in Edinburgh, Anno 1740. To which is subjoined, An inquiry into the nature, Obligation, and Advantages of religious fellowship: Together with an Attempt to direct in the proper Exercise of it. First published in the year 1746, by Mr. John Warden, then Minister of the Gospel in Campsie.