Colquhoun, John (1748 - 1827), CofS minister and author. Born in the parish of Luss (Dunbartonshire), Colquhoun attributed his conversion to the answer to the Shorter Catechism's question, 'What is effectual calling?' Referred by a teacher to Thomas Boston's* Fourfold State, he began an acquaintance with Boston's writings which continued throughout his life. He studied at the University of Glasgow, was ordained to the New Church (St John's), South Leith, in 1781 and remained there until his death. He was a popular and influential evangelical preacher, whose sermons and writings reflect in grea...