10 Behold thou hast a gift, and blessed art thou because of thy gift. Remember it is sacred and cometh from above–
11 And if thou wilt inquire, thou shalt know mysteries which are great and marvelous; therefore thou shalt exercise thy gift, that thou mayest find out mysteries, that thou mayest bring many to the knowledge of the truth, yea, convince them of the error of their ways.
12 Make not thy gift known unto any save it be those who are of thy faith. Trifle not with sacred things.
D&C 63:64 Remember that that which cometh from above is sacred, and must be spoken with care, and by constraint of the Spirit; and in this there is no condemnation, and ye receive the Spirit through prayer; wherefore, without this there remaineth condemnation.
There is much more in D&C 63 about signs and the seeking thereof.
JST Matthew 7
1 Now these are the words which Jesus taught his disciples that they should say unto the people.
9 Go ye into the world, saying unto all, Repent, for the kingdom of heaven has come nigh unto you.
10 And the mysteries of the kingdom ye shall keep within yourselves; for it is not meet to give that which is holy unto the dogs; neither cast ye your pearls unto swine, lest they trample them under their feet.
11 For the world cannot receive that which ye yourselves, are not able to bear; wherefore ye shall not give your pearls unto them, lest they turn again and rend you.
12 Say unto them, Ask of God; ask, and it shall be given you; seek, and ye shall find; knock, and it shall be opened unto you.
13 For every one that asketh, receiveth; and he that seeketh, findeth; and unto him that knocketh, it shall be opened.
There is a standing request from God to his disciples to not disclose the mysteries of the kingdom, which come to us by revelation through faith, without being asked to do so, but rather we are to teach repentance and faith. The reason for this request to those sent forth is because without repenting from all sin and exercising faith and thus entering into a covenant with God, men cannot become the children of Christ, but are instead children of the devil.
Carnal men cannot keep the law of God and the mysteries therefore serve only to condemn them, for when they hear the things which tickle their ears and satiate the lust of curiosity, they think they know stuff, when in fact they know nothing but have merely heard a report. And by satiating that lust of curiosity, a motivation for calling upon God in faith to receive, whereby they may become the children of God, is eliminated.
Therefore, divulging the mysteries of the kingdom without request of God serves to damn people. Signs do not produce faith.
So what ought to be taught?
D&C 19:31 And of tenets thou shalt not talk, but thou shalt declare repentance and faith on the Savior, and remission of sins by baptism, and by fire, yea, even the Holy Ghost.
Mosiah 25:22 And thus, notwithstanding there being many churches they were all one church, yea, even the church of God; for there was nothing preached in all the churches except it were repentance and faith in God.
That teaching – repentance and faith in God – characterizes the church of God.
Alma 13:6 And [priests] thus being called by this holy calling, and ordained unto the high priesthood of the holy order of God, to teach his commandments unto the children of men, that they also might enter into his rest[.]
And that teaching – the commandments of God – characterizes the priests of God.
JST Matthew 5:21 Therefore, all things whatsoever ye would that men should do to you, do ye even so to them; for this is the law and the prophets.
And that teaching – as ye would that men should do to you, do ye also to them likewise – characterizes the prophets of God.
3 Nephi 11:29 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 that behavior – disputing, arguing, contesting, contradicting, accusing – marks those who are not of God.
Perhaps more importantly, the existence of that standing request to not divulge the mysteries of the kingdom leads to this conclusion: just because someone doesn’t claim authority or reveal mysteries or speak of spiritual experiences, doesn’t mean they don’t have authority, don’t know mysteries, or have not had spiritual experiences. Therefore, that the leadership of the Church, or anyone else, doesn’t speak of such things means nothing in and of itself. A just judge cannot come to a conclusion concerning their knowledge, or lack thereof, based solely upon the absence of these things from their teachings.