Joseph Smith taught Latter-day Saints that their religion gives them the right and privilege to accept all truth, and to reject false teachings and traditions. “Mormonism is truth; and every man who embraces it feels himself at liberty to embrace every truth: consequently the shackles of superstition, bigotry, ignorance, and priestcraft, fall at once from his neck; and his eyes are opened to see the truth, and truth greatly prevails…”. (Chapter 22 of “Teachings of the Presidents of the Church: Joseph Smith”)
“… 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, as evil spirits will have more knowledge, and consequently more power than many men who are on the earth. Hence it needs revelation to assist us, and give us knowledge of the things of God.” (History of the Church, 4:588; from a discourse given by Joseph Smith on Apr. 10, 1842, in Nauvoo, Illinois; reported by Wilford Woodruff.)
“Mormonism,” so-called, embraces every principle pertaining to life and salvation, for time and eternity. No matter who has it. If the infidel has got truth it belongs to “Mormonism.” The truth and sound doctrine possessed by the sectarian world, and they have a great deal, all belong to this Church. As for their morality, many of them are, morally, just as good as we are. All that is good, lovely, and praiseworthy belongs to this Church and Kingdom. “Mormonism” includes all truth. There is no truth but what belongs to the Gospel. It is life, eternal life; it is bliss; it is the fullness of all things in the gods and in the eternities." (DBY, 3).
"God hath not revealed anything to Joseph, but what he will make known unto the Twelve, and even the least Saint may know all things as fast as he is able to bear them"... (Discourses of the Prophet Joseph Smith, p. 150-151)