1 Samuel 26:22-24

22 Yea, he that repenteth and exerciseth faith, and bringeth forth good works, and prayeth continually without ceasing-unto such it is given to know the mysteries of God; yea, unto such it shall be given to reveal things which never have been revealed; yea, and it shall be given unto such to bring thousands of souls to repentance, even as it has been given unto us to bring these our brethren to repentance.

23 Now do ye remember, my brethren, that we said unto our brethren in the land of Zarahemla, we go up to the land of Nephi, to preach unto our brethren, the Lamanites, and they laughed us to scorn?

24 For they said unto us: Do ye suppose that ye can bring the Lamanites to the knowledge of the truth? Do ye suppose that ye can convince the Lamanites of the incorrectness of the traditions of their fathers, as stiffnecked a people as they are; whose hearts delight in the shedding of blood; whose days have been spent in the grossest iniquity; whose ways have been the ways of a transgressor from the beginning? Now my brethren, ye remember that this was their language.