William Law (1816). “A Serious Call to a Devout and Holy Life: Adapted to the State and Condition of All Orders of Christians by the Late ... ; to which is Added a Biographical Sketch of the Author”, p.234
William Law (2001). “A Serious Call to a Devout and Holy Life, adapted to the State and Condition of all Orders of Christians, Volume 4”, p.139, Wipf and Stock Publishers