In 1762 he launched a vigorous attack on Methodism under the title of "The Doctrine of Grace". He also engaged in a keen controversy with Robert Lowth, later bishop of London, on the book of Job, in which Lowth brought home charges of lack of scholarship and of insolence that admitted of no denial. His last important act was to found in 1768 the Warburtonian lecture at Lincoln's Inn, "to prove the truth of revealed religion ... from the completion of the prophecies of the Old and New Testament which relate to the Christian Church, especially to the apostasy of Papal Rome."