Observations on some fatal mistakes, in a book lately published, and intitled, The doctrine of grace; or, The office and operations of the Holy Spirit vindicated from the insults of infidelity, and the abuses of fanaticism. By Dr. William Warburton, Lord Bishop of Gloucester : In a letter to a friend. By George Whitefield, A.M. late of Pembroke College, Oxford, and Chaplain to the Countess of Huntingdon. [Four lines from the Bishop of Gloucester's Preface].