JT declares purpose of First Vision in discussion of priesthood, missionary work, and enlightenment.
John Taylor, "The Interest of Humanity Should Be Observed," in Journal of Discourses, 26 vols. (Liverpool: William Budge, 1880), 20:257
When the Father and the Son and Moroni and others came to Joseph Smith, he had a priesthood conferred upon him which he conferred upon others for the purpose of manifesting the laws of life, the Gospel of the Son of God, by direct authority, that light and truth might be spread forth among all nations.