By the power of the Holy Ghost we may know the truth of all things (see Moro. 10:5). By his power we may have the mysteries of God unfolded to us (see 1 Ne. 10:19), all things which are expedient (see D&C 18:18; D&C 39:6). The Holy Ghost shows us what we should do (see 2 Ne. 32:5). — Elder Dallin H. Oaks, “Always Have His Spirit,” General Conference, October 1996
Mysteries of God are spiritual truths known only by revelation. God reveals his mysteries to those who are obedient to the gospel. Some of God’s mysteries are yet to be revealed. — The Guide to the Scriptures, “Mysteries of God,” LDS.org
There is one principle that I wish the people would understand and lay to heart. Just as fast as you will prove before your God that you are worthy to receive the mysteries, if you please to call them so, of the Kingdom of heaven – that you are full of confidence in God – that you will never betray a thing that God tells you – that you will never reveal to your neighbor that which ought not to be revealed, as quick as you prepare to be entrusted with the things of God, there is an eternity of them to bestow upon you. Instead of pleading with the Lord to bestow more upon you, plead with yourselves to have confidence in yourselves, to have integrity in yourselves, and know when to speak and what to speak, what to reveal, and how to carry yourselves and walk before the Lord. And just as fast as you prove to him that you will preserve everything secret that ought to be – that you will deal out to your neighbors all which you ought, and no more, and learn how to dispense your knowledge to your families, friends, neighbors, and brethren, the Lord will bestow upon you, and give to you, and bestow upon you, until finally he will say to you, “you shall never fall; your salvation is sealed unto you; you are sealed up unto eternal life and salvation, through your integrity. — Discourses of Brigham Young, 4:371.