“It was the Prophet Joseph Smith who said, speaking of this refining process, that he was like a huge, rough stone rolling down the mountainside, and the only polishing he got was when some rough corner came in contact with something else, knocking off a corner here and a corner there. But, he said, ‘Thus I will become a … polished shaft in the quiver of the Almighty.’ [History of the Church, 5:401.]

“So, we must be refined; we must be tested in order to prove the strength and power that are in us.” (Teachings of Presidents of the Church: Harold B. Lee, p. 208).