Revile not against revilers

When sharing the gospel or defending beliefs, Church members are to speak and act with humility and civility. The Lord commands His disciples to love others, especially when there is a difference of opinion. 

Elder Dallin H. Oaks explained the importance of avoiding contention:

“The gospel has many teachings about keeping the commandments while living among people with different beliefs and practices. The teachings about contention are central. When the resurrected Christ found the Nephites disputing over the manner of baptism, He gave clear directions on how this ordinance should be performed. Then He taught this great principle:

“‘There shall be no disputations among you, as there have hitherto been; neither shall there be disputations among you concerning the points of my doctrine, as there have hitherto been.

“‘For verily, verily I say unto you, he that hath the spirit of contention is not of me, but is of the devil, who is the father of contention, and he stirreth up the hearts of men to contend with anger, one with another.

“‘Behold, this is … my doctrine, that such things should be done away’ (3 Nephi 11:28–30; emphasis added).

“The Savior did not limit His warning against contention to those who were not keeping the commandment about baptism. He forbade contention by anyone. Even those who keep the commandments must not stir up the hearts of men to contend with anger. The ‘father of contention’ is the devil; the Savior is the Prince of Peace.

“Similarly, the Bible teaches that ‘wise men turn away wrath’ (Proverbs 29:8). The early Apostles taught that we should ‘follow after the things [that] make for peace’ (Romans 14:19) and ‘[speak] the truth in love’ (Ephesians 4:15), ‘for the wrath of man worketh not the righteousness of God’ (James 1:20). In modern revelation the Lord commanded that the glad tidings of the restored gospel should be declared ‘every man to his neighbor, in mildness and in meekness’ (D&C 38:41), ‘with all humility, … reviling not against revilers’ (D&C 19:30)” (“Loving Others and Living with Differences,” Ensign or Liahona, Nov. 2014, 25–26).