The Christian's great interest : In two parts. I. The trial of a saving interest in Christ. II. The way how to attain it. By Mr. William Guthrie, minister of the Gospel at Finwick. To which is prefixed, a large account of his life, &c. by way of introduction, by the late Reverend Mr William Dunlop; and a preface, by the late Reverend Mr Trail; with some account of the author from Mr Wodrow's history.