The Lord has explained, he that hath the spirit of contention is not of me (3 Nephi 11:29). The source of such contention is pride, Only by pride cometh contention (Prov 13:10). Again from Proverbs, we learn that the tendency to contend is a sign of foolishness, A fool’s lips enter into contention, and his mouth calleth for strokes. A fool’s mouth is his destruction, and his lips are the snare of his soul (Prov 18:6-7). Yet, from time to time, the Latter-day saints are guilty of this sin. If you don’t believe this, it is because you have never attended a church basketball game.
"Throughout the scriptures the Lord has warned that ‘there should be no contention one with another’ (Mosiah 18:21) for it is ’unprofitable and vain.’ (Titus 3:9.) The Lord has made it clear that contention is ’not of me, but is of the devil.’ (3 Ne. 11:29.)
"A priesthood quorum instructor would begin his lesson each week by focusing on some controversial topic. While the discussion proved lively and tested his brethren’s tempers, it was a most unprofitable hour, because the Spirit of the Lord was not present. A gentle reminder from his quorum leader helped him to see the destructive nature of his teaching technique.
’And he commanded them that there should be no contention one with another, but that they should look forward with one eye, having their hearts knit together in unity and in love one towards another.’ (Mosiah 18:21)" (Church News, Jun. 20, 1992)
George Q. Cannon
“My brethren and sisters, above all things, therefore, we should seek for this spirit of union and love. It should be sought for in our councils, and we should not contend. Now, suppose that I should take it into my head to say that a certain doctrine is true, and I contend for it, determined to have it so; does my contention make it true? Suppose that I should contend from now until the Savior came that it is true, would my contention make it true? Certainly not. I cannot change a principle of truth. Then why contend or dispute, or argue about it?…There can be no change wrought in doctrine and in truth by our contention. But I will tell you where there is room for differences of opinion--in regard to the policy to be pursued. There ought to be no contention, however. God speaks against it. We have no right to be a disputing, contentious people. And whenever I dispute with my brother I am likely to grieve the Spirit of the Lord and darken my own mind. Therefore, let us avoid contention, in our councils and in all our intercourse one with another.” (Collected Discourses 1886-1898, ed. by Brian Stuy, vol. 4, George Q. Cannon, Apr. 7, 1895)
Joseph F. Smith
“I pray God that this spirit may especially enter into the hearts of this people, that they may strive for peace among themselves, that peace may dwell in their own hearts and houses, that peace may exist between neighbors, that peace, goodwill, love and union may characterize the associations of members of the Church with their fellow members, and that there may be no contention among them, nor strife, nor bitterness, nor back-sliding, nor back-biting, nor complaint of any description, but that peace on earth and good will to men may pervade the hearts and minds of all the members of the Church of Jesus Christ of Latter-day Saints; and that from them this spirit of peace and love for God and for our fellow man may go out into the world, as far as we have power to send it forth through the elders of the Church and otherwise, that men may hear the good tidings and receive them in their hearts, obey the truth, and join the ranks of the peaceful, of the peace-loving, of the peace-makers, of the God-fearing, and of the God-loving people that all Latter-day Saints should be, in every part of the world.” (Conference Reports, Oct. 1914)