Bruce R. McConkie
"To gain faith men must first have knowledge; then as their faith increases, they come to a state where it is supplanted by perfect knowledge; and in any field in which perfect knowledge has been gained, ’faith is dormant.’ (Alma 32:21-34.)…The Brother of Jared is one who followed this course until he saw the Lord. As Moroni explained it, ’Because of the knowledge of this man he could not be kept from beholding within the veil; and he saw the finger of Jesus, which, when he saw, he fell with fear; for he knew that it was the finger of the Lord; and he had faith no longer, for he knew, nothing doubting. Wherefore, having this perfect knowledge of God, he could not be kept from within the veil, therefore he saw Jesus; and he did minister unto him.’ Indeed, ’The Lord could not withhold anything from him, for he knew that the Lord could show him all things.’ (Ether 3:19-26.)
’And there were many whose faith was so exceeding strong, even before Christ came, who could not be kept from within the veil, but truly saw with their eyes the things which they had beheld with an eye of faith, and they were glad.’ (Ether 12:19.) Today as anciently the same effects flow from faith. ’It is the privilege of every elder to speak of the things of God,’ the Prophet said, ’and could we all come together with one heart and one mind in perfect faith the veil might as well be rent today as next week, or any other time.’ (Teachings, p. 9; D. & C. 93:1.)" (Mormon Doctrine, p. 267)