As reproduced in Hyrum L. Andrus and Helen Mae Andrus, Personal Glimpses of the Prophet Joseph Smith (American Fork, UT: Covenant Communications, 2009), 59-60:
During these interviews he taught me many great and glorious principles concerning God and the heavenly order of eternity. It was at this time that I received from him the first idea of eternal family organization, and the eternal union of the sexes in those inexpressibly endearing relationships which none but the highly intellectual, the refined and pure in heart, know how to prize, and which are at the very foundation of everything worthy to be called happiness.
Till then I had learned to esteem kindred affections and sympathies as appertaining solely to this transitory state, as something from which the heart must be entirely weaned, in order to be fitted for its heavenly state.
It was Joseph Smith who taught me how to prize the endearing relationships of father and mother, husband and wife; of brother and sister, son and daughter.It was from him that I learned that the wife of my bosom might be secured to me for time and all eternity; and that the refined sympathies and affections which endeared us to each other emanated from the fountain of divine eternal love. It was from him that I learned that we might cultivate these affections, and grow and increase in the same to all eternity; while the result of our endless union would be an offspring as numerous as the stars of heaven, or the sands of the sea shore.
It was from him that I learned the true dignity and destiny of a son of God, clothed with an eternal priesthood, as the patriarch and sovereign of his countless offspring. It was from him that I learned that the highest dignity of womanhood was, to stand as a queen and priestess to her husband, and to reign for ever and ever as the queen mother of her numerous and still increasing offspring.
I had loved before, but I knew not why. But now I loved — with a pureness — an intensity of elevated, exalted feeling, which would lift my soul from the transitory things of this groveling sphere and expand it as the ocean. I felt that God was my heavenly Father indeed; that Jesus was my brother, and that the wife of my bosom was an immortal, eternal companion; a kind ministering angel, given to me as a comfort, and a crown of glory for ever and ever. In short, I could now love with the spirit and with the understanding also.