Joseph Smith, Jr. and Sidney Rigdon, Lectures on Faith — Lecture Third
“ An idea of these facts does away doubt, and makes faith exceedingly strong.21 But it is equally as necessary that men should have the idea that he is a God who changes not, in order to have faith in him, as it is to have the idea that he is gracious and long suffering. For without the idea of unchangibleness in the character of the Deity, doubt would take the place of faith. But with the idea that he changes not, faith lays hold upon the excellencies in his character with unshaken confidence, believing he is the same yesterday, to-day and forever, and that his course is one eternal round. ”
