Many people have questioned the literal truth of the Lord's declaration that by faith mountains may be removed from their place. Plainly there would have to be a purpose in harmony with the divine mind and plan, in order that faith could be exerted at all in such an undertaking. Neither such a miracle nor any other is possible as a gratification of the yearning for curiosity, nor for display, nor for personal gain or selfish satisfaction. Christ wrought no miracle with any such motive; He persistently refused to show signs to mere signseekers. But to deny the possibility of a mountain being removed through faith, under conditions that would render such removal acceptable to God, is to deny the word of God, both as to this specific possibility, and as to the general assurance that "nothing shall be impossible" to him who hath faith adequate to the end desired. It is worthy of note, however, that the Jews in the days of Christ and since often spoke of removing mountains as a figurative expression for the overcoming of difficulties. According to Lightfoot and other authorities a man able to solve intricate problems, or of particular power in argument or acumen in judgment, was referred to as a "rooter up of mountains."
James E. Talmage (Jesus the Christ, p. 396)