“Mormonism is truth, or in other words the doctrine of the Latter-Day Saints is truth…The first and fundamental principle of our holy religion is that we believe that we might have the right to embrace all, and every item of truth, without limitation or without being circumscribed or prohibited by the creeds or superstitious notions of men, or by the dominations of one another, when truth has been clearly demonstrated to our minds, and we have the highest degree of evidence of the same.”
Josesph Smith, Letter from Joseph Smith to Isaac Gallad, March 22, 1839, Liberty Jail, Liberty Missouri, published in the Times and Seasons, February 1840, pp. 53-54
“‘Mormonism’...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… 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.”
Brigham Young, Discourses of Brigham Young, page 2
"Teach ye diligently and my grace shall attend you, that you may be instructed more perfectly in theory, in principle, in doctrine, in the law of the gospel, in all things that pertain unto the kingdom of God, that are expedient for you to understand; Of things both in heaven and in the earth, and under the earth; things which have been, things which are, things which must shortly come to pass; things which are at home, things which are abroad; the wars and the perplexities of the nations, and the judgments which are on the land; and a knowledge also of countries and of kingdoms—That ye may be prepared in all things when I shall send you again to magnify the calling whereunto I have called you, and the mission with which I have commissioned you."
"...If there is anything virtuous, lovely, or of good report or praiseworthy, we seek after these things"
Thirteenth Article of Faith