An Address to All Believers in Christ: By A Witness to the Divine Authenticity of the Book of MormonEarly devotee to the Mormon church David Whitmer issues here his famous missive addressed to all the Christians on Earth. Testifying to the existence of the golden plates discovered by Joseph Smith in New York State, David Whitmer expounds upon the principles of Mormonism and encourages readers to heed his declaration. More controversially, we hear Whitmer's account of how the church gravitated to unusual beliefs and practices such as polygamy.