Just as it would be unwise and dangerous to feed strong meat to infants, so also it is unwise and dangerous to provide deeper doctrines or sacred ordinances for public display (see JST, Matthew 7:9-11; see also Matthew 13:10-13; 1 Corinthians 3:1-2; D&C 19:21-22).
Too frequently those who encounter these things prematurely are unable to digest them properly and ultimately turn with bitterness against the very source of truth. In short, it matters a great deal not only what people are taught, but also when they are taught it.
“Nevertheless They Are Laid Under a Strict Command That They Shall Not Impart”
And thus it is that the Latter-day Saints are possessors and stewards over sacred matters, holy things, which “are not lawful for man to utter” (D&C 76:115; see also 2 Corinthians 12:4).
Some experiences are ineffable, so transcendently glorious that they defy human expression or description. Of these things it is not possible for man to speak. Some truths and experiences “are not lawful for man to utter” in the sense that it is not permitted or appropriate to speak of them, except as led and directed by the Holy Spirit.
Some special things are to be kept within the household of faith, among those who believe (see Moses 1:42; Moses 4:32). “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” (D&C 63:64).