“A Flame of Unquenchable Fire”
Joseph F. McConkie, Robert L. Millet
Joseph Smith taught that the inner torment of disappointment in the mind of man, the pangs of conscience in the face of wilful sin, is as a lake of fire and brimstone (see Teachings, p. 357).
Doctrinal Commentary on the Book of Mormon, Vol. 4
References
Mormon 9:4–6