1. Put on the whole armour of God.
Read: Gospel Topics – Satan
D&C 76:26 Perdition
Perdition means lost. It means losing something that you had. It means one fallen from high estate. You can’t be Perdition; you can’t be lost unless you were found. And you can’t be fallen unless you were high, fallen from high estate. (Hugh Nibley, Ancient Documents and the Pearl of Great Price.)
D&C 766:29 He maketh war with the saints of God
“The Lord our God has sent us here to get experience in these things so that we may know the good from the evil and be able to close our hearts against the evil. … It is true that some have greater power of resistance than others, but everyone has the power to close his heart against doubt, against darkness, against unbelief, against depression, against anger, against hatred, against jealousy, against malice, against envy. God has given this power unto all of us, and we can gain still greater power by calling upon Him for that which we lack. If it were not so, how could we be condemned for giving way to wrong influences?
“There could be no condemnation for our doing what we could not help; but we can help yielding to wrong influences and being quarrelsome and selfish. We can help giving way to the spirit of theft, and we can resist the spirit of lust. God has given us power to resist these things, that our hearts may be kept free from them and also from doubt; and when Satan comes and assails us, it is our privilege to say, ‘Get thee behind me, Satan, for I have no lot nor portion in you, and you have no part in me. I am in the service of God, and I am going to serve Him, and you can do what you please. It is no use you presenting yourself with your blandishments to me. You come and try to insinuate into my heart evil thoughts about the servants of God or about the work of God, and I will not listen to you; I will close my heart against you. …’
“Whenever darkness fills our minds, we may know that we are not possessed of the Spirit of God, and we must get rid of it. When we are filled with the Spirit of God, we are filled with joy, with peace and with happiness no matter what our circumstances may be; for it is a spirit of cheerfulness and of happiness.” (George Q Cannon, Gospel Truth, 1:19–20.)

D&C 27:15-18 My whole armor
‘Truth is to be the substance of which the girdle about your loins is to be formed, if your virtue and vital strength are to be safeguarded. You should all strive to keep yourselves worthy to enter into the new and everlasting covenant of marriage in the temple for time and all eternity.
Now what about the breastplate which will safeguard your heart, or your conduct in life? It shall be made of stuff called righteousness. The righteous man strives for self-improvement, knowing that he has daily need of repentance for his misdeeds or his neglect.
His body is not dissipated by the burdens imposed by the demands of riotous living; his judgment is not rendered faulty by the follies of youth; he is clear of vision, keen of intellect, and strong of body.
Your feet, which represent your goals or objectives in life, are to be shod with “the preparation of the gospel of peace.” Preparedness is the way to victory, and “eternal vigilance is the price of safety.” Whether in speech or in song, in physical or moral combat, the tide of victory rests with him who is prepared.
Now to the last piece of the prophet-teacher’s armored dress. We will put “the helmet of salvation” upon our head. Our head or intellect is the controlling member of the body. It must be well protected against the enemy, for “as a man thinketh in his heart, so is he.” Salvation means the attainment of the eternal light to live in the presence of God the Father and the Son as a reward for a good life in mortality. With the goal of salvation ever in our mind’s eye, as the ultimate to be achieved, our thinking and our decisions, which determine action, will always challenge all that would jeopardize that glorious future state.’ (Harold B Lee, A Message from the First Presidency, Ensign Jan 1971)
2. Live the law of chastity.

Watch: We Believe in Being Chaste – Elder Bednar
D&C 42:23 He that looketh upon a woman to lust after her
‘I plead with you boys tonight to keep yourselves free from the stains of the world… You must not fool around with the Internet to find pornographic material. You must not dial a long-distance telephone number to listen to filth. You must not rent videos with pornography of any kind. This salacious stuff simply is not for you. Stay away from pornography as you would avoid a serious disease. It is as destructive. It can become habitual, and those who indulge in it get so they cannot leave it alone. It is addictive.
It is a five-billion-dollar business for those who produce it. They make it as titillating and attractive as they know how. It seduces and destroys its victims. It is everywhere. It is all about us. I plead with you young men not to get involved in its use. You simply cannot afford to.’ (Gordon B Hinckley, “Living Worthy of the Girl You Will Someday Marry,” Ensign, May 1998, 49)
D&C 121:45-46 Virtue
‘ Deep beauty springs from virtue. It is the beauty of being chaste and morally clean. It is the kind of beauty that you see in the eyes of virtuous women like your mother and grandmother. It is a beauty that is earned through faith, repentance, and honoring covenants.
The world places so much emphasis on physical attractiveness and would have you believe that you are to look like the elusive model on the cover of a magazine. The Lord would tell you that you are each uniquely beautiful. When you are virtuous, chaste, and morally clean, your inner beauty glows in your eyes and in your face. My grandfather used to say, “If you live close to God and His infinite grace—you won’t have to tell, it will show in your face.” When you are worthy of the companionship of the Holy Ghost, you are confident and your inner beauty shines brightly. And so “let virtue garnish thy thoughts unceasingly; then shall thy confidence wax strong in the presence of God; and … the Holy Ghost shall be thy constant companion.”’ (Elaine Dalton, General Conference, April 2010)
Marion G Romney said ‘I can think of no blessings to be more fervently desired than those promised to the pure and virtuous. Jesus spoke of specific rewards for different virtues but reserved the greatest gift, so it seems to me, for the pure in heart, for they, said he, shall see their God. (Matt 5:48) And not only shall they see the Lord but they shall feel at home in his presence.’
3. Be honest.
Watch: Honesty -You Better Believe It
D&C 42:21 Thou Shalt Not Lie
“The seriousness of lying is not measured only in injury or pain inflicted on the one deceived. Lying has a devastating effect also on the perpetrator. It robs the liar of self-respect, and deadens his ability to recognize the difference between truth and error. When a lie is told often enough, even the one who knowingly spread it may begin to believe it. This was the case with the antichrist Korihor in the Book of Mormon (see Alma 30:52-53).” (Robert J. Matthews, “Thou Shalt Not Bear False Witness,” Ensign, Oct. 1994, 56)
D&C 97:8 Hearts are Honest
‘Those who are honest are fair and truthful in their speech, straightforward in their dealings, free of deceit, and above stealing, misrepresentation, or any other fraudulent action. Honesty is of God and dishonesty of the devil; the devil was a liar from the beginning. Righteousness is living a life that is in harmony with the laws, principles, and ordinances of the gospel.’ (Joseph B Wirthlin,”Without Guile,” Ensign, May 1988, 80-81)
4. Use language that reverences God and is edifying.
‘How you communicate should reflect who you are as a son or daughter of God. Clean and intelligent language is evidence of a bright and wholesome mind. Good language that uplifts, encourages, and compliments others invites the Spirit to be with you. Our words, like our deeds, should be filled with faith, hope, and charity.

Choose friends who use good language. Help others improve their language by your example. Be willing to politely walk away or change the subject when those around you use inappropriate language.
Speak kindly and positively about others. Choose not to insult others or put them down, even in joking. Avoid gossip of any kind, and avoid speaking in anger. When you are tempted to say harsh or hurtful things, leave them unsaid.’ (For the Strength of Youth)
D&C 63:61-62 The name of the Lord
‘This scripture shows that we take the name of the Lord in vain when we use his name without authority. This obviously occurs when the sacred names of God the Father and his Son, Jesus Christ, are used in what is called profanity: in hateful cursings, in angry denunciations, or as marks of punctuation in common discourse.
The names of the Father and the Son are used with authority when we reverently teach and testify of them, when we pray, and when we perform the sacred ordinances of the priesthood.
There are no more sacred or significant words in all of our language than the names of God the Father and his Son, Jesus Christ.’ (Dallin H Oaks, General Conference, April 1986)
D&C 136:21 Take the name of the Lord in vain
‘In the revelation given to President Brigham Young on January 14, 1847, while the Saints were preparing to leave Winter Quarters for these valleys in the West, the Lord said to them, “Keep yourselves from evil to take the name of the Lord in vain, for I am the Lord your God, even the God of your fathers, the God of Abraham and of Isaac and of Jacob” (D&C 136:21).
In a general epistle to the entire Church issued by the First Presidency on April 8, 1887, a hundred years ago, they said concerning this problem, which evidently was serious then as it is now, “The habit … , which some young people fall into, of using vulgarity and profanity … is not only offensive to well-bred persons, but it is a gross sin in the sight of God, and should not exist among the children of the Latter-day Saints” (in Messages of the First Presidency, comp. James R. Clark, 6 vols., Salt Lake City: Bookcraft, 1965-75, 3:112-13).
I once worked with a group of railroad men who seemed to pride themselves on the use of profanity. They tried to make an art of it. I recall handing a written instruction to a switchman. It was his job to take care of the matter as instructed, but he thought it inconvenient that he should have to do so at that time. On reading the order, he flew into a tantrum. He was a fifty-year-old man, but he acted like a spoiled child. He threw his cap on the ground and jumped on it and let forth such a string of expletives as to seem to cause the air to turn blue around him. Every third or fourth word was the name of Deity spoken in vain.
I thought, how childish can a grown man be? The very idea of a man acting and speaking like that was totally repugnant. I could never again give him my full respect.
When I was a small boy in the first grade, I experienced what I thought was a rather tough day at school. I came home, walked in the house, threw my book on the kitchen table, and let forth an expletive that included the name of the Lord.
My mother was shocked. She told me quietly, but firmly, how wrong I was. She told me that I could not have words of that kind coming out of my mouth. She led me by the hand into the bathroom, where she took from the shelf a clean washcloth, put it under the faucet, and then generously coated it with soap. She said, “We’ll have to wash out your mouth.” She told me to open it, and I did so reluctantly. Then she rubbed the soapy washcloth around my tongue and teeth. I sputtered and fumed and felt like swearing again, but I didn’t. I rinsed and rinsed my mouth, but it was a long while before the soapy taste was gone. In fact, whenever I think of that experience, I can still taste the soap. The lesson was worthwhile. I think I can say that I have tried to avoid using the name of the Lord in vain since that day. I am grateful for that lesson.
On one occasion, Jesus said to the multitude, “Not that which goeth into the mouth defileth a man; but that which cometh out of the mouth, this defileth a man” (Matt. 15:11).’ (Gordon B Hinckley, “Take Not the Name of God in Vain,” Ensign, Nov. 1987, 45-46)