“I admire men and women who have developed the questing spirit, who are unafraid of new ideas as stepping stones to progress. We should, of course, respect the opinions of others, but we should also be unafraid to dissent – if we are informed. Thoughts and expressions compete in the marketplace of thought, and in that competition truth emerges triumphant. Only error fears freedom of expression. . . This free exchange of ideas is not to be deplored as long as men and women remain humble and teachable. Neither fear of consequence or any kind of coercion should ever be used to secure uniformity of thought in the church. People should express their problems and opinions and be unafraid to think without fear of ill consequences. . . . We must preserve the freedom of the mind in the church and resist all efforts to suppress it.”

(Hugh B. Brown, The Abundant Life: The Memoirs of Hugh B. Brown, ed. Edwin B. Firmage (Salt Lake City: Signature Books, 1988), 137-39; Hugh B. Brown, “An Eternal Quest—Freedom of the Mind,” a speech delivered at Brigham Young University, 13 May 1969, in Speeches of the Year (Provo, UT): Brigham Young University Press, 1969); rpt. In Dialogue: A Journal of Mormon Thought 17 (Spring 1984): 77-83

http://aims.byu.edu/sites/default/files/foundationdocuments/An_Eternal_Quest--Freedom_of_the_Mind--Hugh_B_Brown.pdf