Question: How can we tell if a modern revelation comes from God or Satan?

Compare your thoughts and impressions with the scriptures

God does not want us to be deceived. The scriptures give us this counsel:

37 And whoso treasureth up my word, shall not be deceived, for the Son of Man shall come, and he shall send his angels before him with the great sound of a trumpet, and they shall gather together the remainder of his elect from the four winds, from one end of heaven to the other.

This is perhaps the very reason that our official doctrine consists of the revelations given by Christ and those revelations (everything contained in the standard works) that Christ has told us are his inspired word and contain his Gospel (D&C 42:12-13, 56-60). As we interrogate and weigh correctly and treasure up the most authoritative source of true doctrine, we are promised we won’t be led astray. Preach My Gospel gives this counsel

As you pray for inspiration, you should also confirm your feelings. For example, compare your decisions with the scriptures and the teachings of the living prophets. Be certain that the feelings are consistent with the assignment you have; for example, you will not receive revelation to tell a local bishop how he should perform in his calling. Discuss your decisions and conclusions with your companion, your district leader, or your mission president when appropriate.
President Howard W. Hunter offered this counsel: “Let me offer a word of caution. … I think if we are not careful … , we may begin to try to counterfeit the true influence of the Spirit of the Lord by unworthy and manipulative means. I get concerned when it appears that strong emotion or free-flowing tears are equated with the presence of the Spirit. Certainly the Spirit of the Lord can bring strong emotional feelings, including tears, but that outward manifestation ought not to be confused with the presence of the Spirit itself” (The Teachings of Howard W. Hunter, 184). The Spirit of the Lord always edifies.

As we correctly understand true principles and have a correct understanding of how the Spirit functions as taught by the scriptures and modern prophets and apostles, we can more accurately know what to expect from the spirit and its revelatory power.

The scriptures give us other ways for discerning false spirits from true ones. Read the following scriptures and see what you learn about:

How we discern what comes from God
What God has said about how we can discern false spirits from true ones.

Moroni 7:20–25

But behold, that which is of God inviteth and enticeth to do good continually; wherefore, every thing which inviteth and enticeth to do good, and to love God, and to serve him, is inspired of God.
10 Wherefore, a man being evil cannot do that which is good; neither will he give a good gift.
11 For behold, a bitter fountain cannot bring forth good water; neither can a good fountain bring forth bitter water; wherefore, a man being a servant of the devil cannot follow Christ; and if he follow Christ he cannot be a servant of the devil.
12 Wherefore, all things which are good cometh of God; and that which is evil cometh of the devil; for the devil is an enemy unto God, and fighteth against him continually, and inviteth and enticeth to sin, and to do that which is evil continually.
13 But behold, that which is of God inviteth and enticeth to do good continually; wherefore, every thing which inviteth and enticeth to do good, and to love God, and to serve him, is inspired of God.
14 Wherefore, take heed, my beloved brethren, that ye do not judge that which is evil to be of God, or that which is good and of God to be of the devil.
15 For behold, my brethren, it is given unto you to judge, that ye may know good from evil; and the way to judge is as plain, that ye may know with a perfect knowledge, as the daylight is from the dark night.
16 For behold, the aSpirit of Christ is given to every man, that he may know good from evil; wherefore, I show unto you the way to judge; for every thing which inviteth to do good, and to persuade to believe in Christ, is sent forth by the power and gift of Christ; wherefore ye may know with a perfect knowledge it is of God.
17 But whatsoever thing persuadeth men to do evil, and believe not in Christ, and deny him, and serve not God, then ye may know with a perfect knowledge it is of the devil; for after this manner doth the devil work, for he persuadeth no man to do good, no, not one; neither do his angels; neither do they who subject themselves unto him.
18 And now, my brethren, seeing that ye know the alight by which ye may judge, which light is the light of Christ, see that ye do not judge wrongfully; for with that same judgment which ye judge ye shall also be judged.
19 Wherefore, I beseech of you, brethren, that ye should search diligently in the alight of Christ that ye may know good from evil; and if ye will lay hold upon every good thing, and condemn it not, ye certainly will be a child of Christ.
20 And now, my brethren, how is it possible that ye can lay hold upon every good thing?
21 And now I come to that faith, of which I said I would speak; and I will tell you the way whereby ye may lay hold on every good thing.
22 For behold, God knowing all things, being from everlasting to everlasting, behold, he sent angels to minister unto the children of men, to make manifest concerning the coming of Christ; and in Christ there should come every good thing.
23 And God also declared unto prophets, by his own mouth, that Christ should come.
24 And behold, there were divers ways that he did manifest things unto the children of men, which were good; and all things which are good cometh of Christ; otherwise men were fallen, and there could no good thing come unto them.
25 Wherefore, by the ministering of angels, and by every word which proceeded forth out of the mouth of God, men began to exercise faith in Christ; and thus by faith, they did lay hold upon every good thing; and thus it was until the coming of Christ.

Doctrine and Covenants 49:7–27

7 But ye are commanded in all things to ask of God, who giveth liberally; and that which the Spirit testifies unto you even so I would that ye should do in all holiness of heart, walking uprightly before me, considering the end of your salvation, doing all things with prayer and thanksgiving, that ye may not be seduced by evil spirits, or doctrines of devils, or the commandments of men; for some are of men, and others of devils.
8 Wherefore, beware lest ye are deceived; and that ye may not be deceived seek ye earnestly the best gifts, always remembering for what they are given;
9 For verily I say unto you, they are given for the benefit of those who love me and keep all my commandments, and him that seeketh so to do; that all may be benefited that seek or that ask of me, that ask and not for a sign that they may consume it upon their lusts.
10 And again, verily I say unto you, I would that ye should always remember, and always retain in your minds what those gifts are, that are given unto the church.
11 For all have not every gift given unto them; for there are many gifts, and to every man is given a gift by the Spirit of God.
12 To some is given one, and to some is given another, that all may be profited thereby.
13 To some it is given by the Holy Ghost to know that Jesus Christ is the Son of God, and that he was crucified for the sins of the world.
14 To others it is given to believe on their words, that they also might have eternal life if they continue faithful.
15 And again, to some it is given by the Holy Ghost to know the differences of administration, as it will be pleasing unto the same Lord, according as the Lord will, suiting his mercies according to the conditions of the children of men.
16 And again, it is given by the Holy Ghost to some to know the diversities of operations, whether they be of God, that the manifestations of the Spirit may be given to every man to profit withal.
17 And again, verily I say unto you, to some is given, by the Spirit of God, the word of wisdom.
18 To another is given the word of knowledge, that all may be taught to be wise and to have knowledge.
19 And again, to some it is given to have faith to be healed;
20 And to others it is given to have faith to heal.
21 And again, to some is given the working of miracles;
22 And to others it is given to prophesy;
23 And to others the discerning of spirits.
24 And again, it is given to some to speak with tongues;
25 And to another is given the interpretation of tongues.
26 And all these gifts come from God, for the benefit of the children of God.
27 And unto the bishop of the church, and unto such as God shall appoint and ordain to watch over the church and to be elders unto the church, are to have it given unto them to discern all those gifts lest there shall be any among you professing and yet be not of God.

Doctrine and Covenants 50:1–3

31 Wherefore, it shall come to pass, that if you behold a spirit manifested that you cannot understand, and you receive not that spirit, ye shall ask of the Father in the name of Jesus; and if he give not unto you that spirit, then you may know that it is not of God.
32 And it shall be given unto you, power over that spirit; and you shall proclaim against that spirit with a loud voice that it is not of God—
33 Not with railing accusation, that ye be not overcome, neither with boasting nor rejoicing, lest you be seized therewith.

Doctrine and Covenants 52:14–19

14 And again, I will give unto you a pattern in all things, that ye may not be deceived; for Satan is abroad in the land, and he goeth forth deceiving the nations—
15 Wherefore he that prayeth, whose spirit is contrite, the same is accepted of me if he obey mine ordinances.
16 He that speaketh, whose spirit is contrite, whose language is meek and edifieth, the same is of God if he obey mine ordinances.
17 And again, he that trembleth under my power shall be made strong, and shall bring forth fruits of praise and wisdom, according to the revelations and truths which I have given you.
18 And again, he that is overcome and bringeth not forth fruits, even according to this pattern, is not of me.
19 Wherefore, by this pattern ye shall know the spirits in all cases under the whole heavens.

Philosophy

How do we know the world is not an illusion? How do we know we are not just a brain in a vat? How do we know our life is not a dream?

We just don't believe any of that, we just take what our senses tell us and feel where the preponderance of evidence lies.

Consider what Joseph Smith told Brigham Young

Tell the brethren to be humble and faithful and be sure to keep the Spirit of the Lord, that it will lead them aright. Be careful and not turn away the still, small voice; it will teach them what to do and where to go; it will yield the fruits of the kingdom. Tell the brethren to keep their heart open to conviction, so that when the Holy Ghost comes to them their hearts will be ready to receive it. They can tell the Spirit of the Lord from all other spirits—it will whisper peace and joy to their souls; it will take malice, hatred, strife and all evil from their hearts, and their whole desire will be to do good” (quoted in Juvenile Instructor, 19 July 1873, 114)

This teaches us they the spirit will always administer intelligence when it touches our hearts. Not just a feeling or a simple emotion.

Prophet Gordon B. Hinckley said:

That’s the test, when all is said and done. Does it persuade one to do good, to rise, to stand tall, to do the right thing, to be kind, to be generous? Then it is of the Spirit of God. . . . If it invites to do good, it is of God. If it inviteth to do evil, it is of the devil. . . . And if you are doing the right thing and if you are living the right way, you will know in your heart what the Spirit is saying to you.
You recognize the promptings of the Spirit by the fruits of the Spirit—that which enlighteneth, that which buildeth up, that which is positive and affirmative and uplifting and leads us to better thoughts and better words and better deeds is of the Spirit of God” (Teachings of Gordon B. Hinckley, 260–61)

This teaches us that the spirit will always teach us to love God and serve him, it’s impressions will always inspire and not disparage or allow us to do something that has not been revealed through his chosen servants.

Elder Dallin H. Oaks stated:

[A person may have] a strong desire to be led by the Spirit of the Lord but . . . unwisely extends that desire to the point of wanting to be led in all things. A desire to be led by the Lord is a strength, but it needs to be accompanied by an understanding that our Heavenly Father leaves many decisions for our personal choices. Personal decision making is one of the sources of the growth we are meant to experience in mortality. Persons who try to shift all decision making to the Lord and plead for revelation in every choice will soon find circumstances in which they pray for guidance and don't receive it. For example, this is likely to occur in those numerous circumstances in which the choices are trivial or either choice is acceptable.
We should study things out in our minds, using the reasoning powers our Creator has placed within us. Then we should pray for guidance and act upon it if we receive it. If we do not receive guidance, we should act upon our best judgment. Persons who persist in seeking revelatory guidance on subjects on which the Lord has not chosen to direct us may concoct an answer out of their own fantasy or bias, or they may even receive an answer through the medium of "false revelation" (“Our Strengths Can Become Our Downfall,” Ensign, Oct. 1994, 13–14)

This statement can apply to everyone, even to General Authorities as a voice of warning. It teaches us to be anxiously engaged in a good cause and do many things of our own free will without having to be commanded in all things.

President Howard W. Hunter said

As from above and elsewhere:

“Let me offer a word of caution. . . . I think if we are not careful . . . , we may begin to try to counterfeit the true influence of the Spirit of the Lord by unworthy and manipulative means. I get concerned when it appears that strong emotion or free-flowing tears are equated with the presence of the Spirit. Certainly the Spirit of the Lord can bring strong emotional feelings, including tears, but that outward manifestation ought not to be confused with the presence of the Spirit itself” (The Teachings of Howard W. Hunter, 184)

Preach My Gospel: A Guide to Missionary Service, "How Do I Recognize and Understand the Spirit?"

The Church of Jesus Christ of Latter-day Saints, Preach My Gospel: A Guide to Missionary Service, (2004)

The Spirit is always available to guide and direct you. However, the Spirit speaks quietly, through your feelings as well as your mind. One great challenge for you and those you work with is to recognize the quiet, subtle promptings of the Holy Ghost.

President Boyd K. Packer taught: “The voice of the Spirit is described in the scripture as being neither ‘loud’ nor ‘harsh.’ It is ‘not a voice of thunder, neither … voice of a great tumultuous noise.’ But rather, ‘a still voice of perfect mildness, as if it had been a whisper,’ and it can ‘pierce even to the very soul’ and ‘cause [the heart] to burn.’ (3 Ne. 11:3; Hel. 5:30; D&C 85:6–7.) Remember, Elijah found the voice of the Lord was not in the wind, nor in the earthquake, nor in the fire, but was a ‘still small voice.’ (1 Kgs. 19:12.)
“The Spirit does not get our attention by shouting or shaking us with a heavy hand. Rather it whispers. It caresses so gently that if we are preoccupied we may not feel it at all. (No wonder that the Word of Wisdom was revealed to us, for how could the drunkard or the addict feel such a voice?)

“Occasionally it will press just firmly enough for us to pay heed. But most of the time, if we do not heed the gentle feeling, the Spirit will withdraw and wait until we come seeking and listening and say in our manner and expression, like Samuel of ancient times, ‘Speak [Lord], for thy servant heareth.’ (1 Sam. 3:10.)” (“The Candle of the Lord,” Ensign, Jan. 1983, 53).

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Notes

Question: How can we tell if a modern revelation comes from God or Satan?