"A man is saved no faster than he gets knowledge, for if he does not get knowledge, he will be brought into captivity by some evil power in the other world. ... Hence it needs revelation to assist us, and give us knowledge of the things of God."
From Teachings of Presidents of the Church: Joseph Smith (2007), 26468. (Joseph Smith, History of the Church 4:588)

Doctrine and Covenants 121:
34 Behold, there are many called, but few are chosen. And why are they not chosen?
35 Because their hearts are set so much upon the things of this world, and aspire to the honors of men, that they do not learn this one lesson--
36 That the rights of the priesthood are inseparably connected with the powers of heaven, and that the powers of heaven cannot be controlled nor handled only upon the principles of righteousness.
37 That they may be conferred upon us, it is true; but when we undertake to cover our sins, or to gratify our pride, our vain ambition, or to exercise control or dominion or compulsion upon the souls of the children of men, in any degree of unrighteousness, behold, the heavens withdraw themselves; the Spirit of the Lord is grieved; and when it is withdrawn, Amen to the priesthood or the authority of that man.
38 Behold, ere he is aware, he is left unto himself, to kick against the pricks, to persecute the saints, and to fight against God.

Doctrine and Covenants 121:
41 No power or influence can or ought to be maintained by virtue of the priesthood, only by persuasion, by long-suffering, by gentleness and meekness, and by love unfeigned;
42 By kindness, and pure knowledge, which shall greatly enlarge the soul without hypocrisy, and without guile--
43 Reproving betimes with sharpness, when moved upon by the Holy Ghost; and then showing forth afterwards an increase of love toward him whom thou hast reproved, lest he esteem thee to be his enemy;
44 That he may know that thy faithfulness is stronger than the cords of death.