The Lord is anxious to give his obedient children the great mysteries of godliness. This blessing is reserved for those who will not harden their hearts, but instead fear God and honor him with their service.
'For thus saith the Lord--I, the Lord, am merciful and gracious unto those who fear me, and delight to honor those who serve me in righteousness and in truth unto the end.
Great shall be their reward and eternal shall be their glory.
And to them will I reveal all mysteries, yea, all the hidden mysteries of my kingdom from days of old, and for ages to come, will I make known unto them the good pleasure of my will concerning all things pertaining to my kingdom.
Yea, even the wonders of eternity shall they know, and things to come will I show them, even the things of many generations.
And their wisdom shall be great, and their understanding reach to heaven; and before them the wisdom of the wise shall perish, and the understanding of the prudent shall come to naught.
For by my Spirit will I enlighten them, and by my power will I make known unto them the secrets of my will--yea, even those things which eye has not seen, nor ear heard, nor yet entered into the heart of man.' (DC 76:5-10)
But is it possible to know the mysteries of God in full during mortality? It would seem that this is not possible during our lifetimes. But imagine the joy of being present when the Savior teaches the mysteries of God during the Millenium. Imagine the blessings of celestial glory when everyone will be given a small white stone by which all that God sees and knows can be both seen and known.
'This earth, in its sanctified and immortal state, will be made like unto crystal and will be a Urim and Thummim to the inhabitants who dwell thereon, whereby all things pertaining to an inferior kingdom, or all kingdoms of a lower order, will be manifest to those who dwell on it; and this earth will be Christ's.
Then the white stone mentioned in Revelation 2:17, will become a Urim and Thummim to each individual who receives one, whereby things pertaining to a higher order of kingdoms will be made known' (DC 130:9-10).
Should we then be complacent with our current understanding of the mysteries? Given the great gap between God's knowledge and ours, should we just throw in the towel until a time when it is earlier to learn? As Paul would say, God forbid. Clearly, we must learn how to receive the peaceable things of the kingdom through our diligence and obedience. For whatever principle of intelligence we attain unto in this life, it will rise with us in the resurrection. And if a person gains more knowledge and intelligence in this life through his diligence and obedience than another, he will have so much the advantage in the world to come (DC 130:18-19).
Joseph Smith
"I advise all to go on to perfection, and search deeper and deeper into the mysteries of Godliness…It has always been my province to dig up hidden mysteries-new things-for my hearers." (History of the Church, vol. 6, p. 363)
Dallin H. Oaks
"Learning the mysteries of God and attaining to what the apostle Paul called 'the measure of the stature of the fulness of Christ' (Eph. 4:13) requires far more than learning a specified body of facts. It requires us to learn certain facts, to practice what we have learned, and, as a result, to become what we, as children of God, are destined to become.
"…(referring to DC 130:18-19) Note that intelligence is something more than knowledge. And note also the implication that knowledge is obtained by diligence and intelligence is obtained by obedience. Admittedly, the two methods are not mutually exclusive. But we come close to an important mystery of the gospel when we understand that the intelligence God desires us to obtain is much more than knowledge, and it cannot be obtained without obedience and revelation. That is the Lord's way, and it is far beyond the ways of the world."(The Lord's Way, p. 43)