“The first thing to do, my brethren [and sisters], is to look to yourselves, to see whether or not you are prepared to teach. No [person] can teach that which [they themself do] not know. It is your duty to teach that Jesus Christ is the redeemer of the world, that Joseph Smith was a prophet of God, and that to him in this last dispensation there appeared God the Father and his Son in person. Do you believe it? Do you feel it?” (Teachings of Presidents of the Church: David O. McKay, p. 121).