Manti

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 The manuscript remained unpublished, however, until 1855 when Parley found a publisher in England.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."