How do you know that a cause is inspired of God? How do you know that people are asking the right questions? How do you know that someone is teaching true doctrines?
24 And it came to pass that I beheld others pressing forward, and they came forth and caught hold of the end of the rod of iron; and they did press forward through the mist of darkness, clinging to the rod of iron, even until they did come forth and partake of the fruit of the tree. 25 And after they had partaken of the fruit of the tree they did cast their eyes about as if they were ashamed.
26 And I also cast my eyes round about, and beheld, on the other side of the river of water, a great and spacious building; and it stood as it were in the air, high above the earth. 27 And it was filled with people, both old and young, both male and female; and their manner of dress was exceedingly fine; and they were in the attitude of mocking and pointing their fingers towards those who had come at and were partaking of the fruit.
28 And after they had tasted of the fruit they were ashamed, because of those that were scoffing at them; and they fell away into forbidden paths and were lost. (1 Nephi 8:24-28)
34 And after [Christ] was slain I saw the multitudes of the earth, that they were gathered together to fight against the apostles of the Lamb; for thus were the twelve called by the angel of the Lord.
35 And the multitude of the earth was gathered together; and I beheld that they were in a large and spacious building, like unto the building which my father saw. And the angel of the Lord spake unto me again, saying: Behold the world and the wisdom thereof; yea, behold the house of Israel hath gathered together to fight against the twelve apostles of the Lamb.
36 And it came to pass that I saw and bear record, that the great and spacious building was the pride of the world; and it fell, and the fall thereof was exceedingly great. And the angel of the Lord spake unto me again, saying: Thus shall be the destruction of all nations, kindreds, tongues, and people, that shall fight against the twelve apostles of the Lamb. (1 Nephi 11:34-36)
2 Behold, verily I say unto you, that there are many spirits which are false spirits, which have gone forth in the earth, deceiving the world. 3 And also Satan hath sought to deceive you, that he might overthrow you.
4 Behold, I, the Lord, have looked upon you, and have seen abominations in the church that profess my name. 5 But blessed are they who are faithful and endure, whether in life or in death, for they shall inherit eternal life. 6 But wo unto them that are deceivers and hypocrites, for, thus saith the Lord, I will bring them to judgment.
7 Behold, verily I say unto you, there are hypocrites among you, who have deceived some, which has given the adversary power; but behold such shall be reclaimed; 8 But the hypocrites shall be detected and shall be cut off, either in life or in death, even as I will; and wo unto them who are cut off from my church, for the same are overcome of the world. 9 Wherefore, let every man beware lest he do that which is not in truth and righteousness before me.
10 And now come, saith the Lord, by the Spirit, unto the elders of his church, and let us reason together, that ye may understand; 11 Let us reason even as a man reasoneth one with another face to face. 12 Now, when a man reasoneth he is understood of man, because he reasoneth as a man; even so will I, the Lord, reason with you that you may understand.
13 Wherefore, I the Lord ask you this question—unto what were ye ordained? 14 To preach my gospel by the Spirit, even the Comforter which was sent forth to teach the truth.
15 And then received ye spirits which ye could not understand, and received them to be of God; and in this are ye justified? 16 Behold ye shall answer this question yourselves; nevertheless, I will be merciful unto you; he that is weak among you hereafter shall be made strong.
17 Verily I say unto you, he that is ordained of me and sent forth to preach the word of truth by the Comforter, in the Spirit of truth, doth he preach it by the Spirit of truth or some other way? 18 And if it be by some other way it is not of God.
19 And again, he that receiveth the word of truth, doth he receive it by the Spirit of truth or some other way? 20 If it be some other way it is not of God.
21 Therefore, why is it that ye cannot understand and know, that he that receiveth the word by the Spirit of truth receiveth it as it is preached by the Spirit of truth. 22 Wherefore, he that preacheth and he that receiveth, understand one another, and both are edified and rejoice together. 23 And that which doth not edify is not of God, and is darkness. 24 That which is of God is light; and he that receiveth light, and continueth in God, receiveth more light; and that light groweth brighter and brighter until the perfect day. (Doctrine and Covenants 50:2:21)
12 And now, verily, verily, I say unto thee, put your trust in that Spirit which leadeth to do good—yea, to do justly, to walk humbly, to judge righteously; and this is my Spirit.
13 Verily, verily, I say unto you, I will impart unto you of my Spirit, which shall enlighten your mind, which shall fill your soul with joy; 14 And then shall ye know, or by this shall you know, all things whatsoever you desire of me, which are pertaining unto things of righteousness, in faith believing in me that you shall receive. (Doctrine and Covenants 11:12-14)
22 But the fruit of the Spirit is love, joy, peace, long suffering, gentleness, goodness, faith, 23 Meekness, temperance. (Galatians 5:22-23)
3 Wherefore, I would speak unto you that are of the church, that are the peaceable followers of Christ, and that have obtained a sufficient hope by which ye can enter into the rest of the Lord, from this time henceforth until ye shall rest with him in heaven.
4 And now my brethren, I judge these things of you because of your peaceable walk with the children of men. 5 For I remember the word of God which saith by their works ye shall know them; for if their works be good, then they are good also.
6 For behold, God hath said a man being evil cannot do that which is good; for if he offereth a gift, or prayeth unto God, except he shall do it with real intent it profiteth him nothing. 7 For behold, it is not counted unto him for righteousness.
8 For behold, if a man being evil giveth a gift, he doeth it grudgingly; wherefore it is counted unto him the same as if he had retained the gift; wherefore he is counted evil before God. 9 And likewise also is it counted evil unto a man, if he shall pray and not with real intent of heart; yea, and it profiteth him nothing, for God receiveth none such. 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 Spirit 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 light 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 light 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. (Moroni 7:3-18)