He revealed himself first to me when I was about fourteen years old, a mere boy. I will tell you about it. There was a reformation among the different religious denominations in the neighborhood where I lived, and I became serious and was desirous to know whatChurch to join. While thinking of this matter, I opened the Testament promiscuously on these words, in James, "Ask of the Lord who giveth to all men liberally and upbraideth not [James 1:5]." I just determined I'd ask him. I immediately went out into the woods where my father had a clearing, and went to the stump where I had stuck my axe when I had quit work, and I kneeled down, and prayed, saying, "0 Lord, what Church shall I join?" Directly I saw a light, and then a glorious personage in the light, and then another personage, and first personage said to the second, "Behold my beloved Son, hear him." I then, addressed this second person, saying, "0 Lord, what Church shall I join." He replied, "don't join any of them, they are all corrupt." The vision then vanished and when I came to myself, I was sprawling on my back; and it was some time before my strength returned. When I went home and told the people that I had a revelation, and that all the churches were corrupt, theypersecuted me, and they have persecuted me ever since. They thought to put me down, but they hav'nt succeeded, and they can't do it"
[Source: Interview, JS by David Nye White, Nauvoo, IL, 21 Aug. 1843; in David Nye White, "The Prairies, Joe Smith, the Temple, the Mormons, &c.," Pittsburgh Weekly Gazette, 15 Sept. 1843; A Documented History of Joseph Smith's First Vision, http://beggarsbread.org/2013/04/01/a-documented-history-of-joseph-smiths-first-vision/]