“Verily, I say unto you, that the wisdom of man, in his fallen state, knoweth not the purposes and the privileges of my holy priesthood, but ye shall know when ye receive a fullness by reason of the anointing: For it is my will, that in time, ye should take unto you wives of the Lamanites and Nephites, that their posterity may become white, delightsome and just, for even now their females are more virtuous than the gentiles.”

Joseph Smith, Jr. – 17 July 1831 revelation, recorded in a letter from W.W. Phelps to Brigham Young, dated 12 August 1861.