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In page William Dunlop (ecclesiastical historian):

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In the latter capacity he was singularly successful. He had great pulpit gifts, much fluency, and a lively fancy; his emotions penetrated his discourses, and brought out his appeals with a rare power of conviction and persuasion. Quick in perception, of very laborious habits, and a tenacious memory, his attainments and learning were regarded as extraordinary, and had his life been prolonged he would doubtless have risen to the highest distinction in the church.