Evie d'Argy

Parley P. Pratt began to work on The Key to the Science of Theology in San Francisco in August 1851, just before leaving for his mission to Chile. He continued writing it while in Chile. He finished the manuscript upon his return to Utah in 1853. The manuscript remained unpublished, however, until 1855 when Parley found a publisher in England. Parley's book represented a lifetime of thought and built on ideas first propounded in Pratt's earlier writings, especially missionary tracts stemming from his years in England. The impact of The Key to the Science of Theology was unparalleled. One Latter-day Saint diarist of the 19th century observed: "We had every encouragement to read the Church publications: The Voice of Warning; the Pearl of Great Price; and Key to Theology."

The lectures herewith presented have been prepared in accordance with the request and appointment of the First Presidency of the Church. The greater number of the addresses were delivered before the Theology Class of the Church University; and, after the close of the class sessions, the lectures were continued before other Church organizations engaged in the study of theology. To meet the desire expressed by the Church authorities - that the lectures be published for use in the various educational institutions of the Church - the matter has been revised, and is now presented in this form.