When teaching an investigator, there is nothing more confusing and wasteful than discussing the mysteries of the kingdom and the most difficult prophecies in scripture. The saving principles of the gospel are simple and teachers should teach them that way. The same counsel is given in the latter-days, let them journey from thence preaching the word by the way, saying none other things than that which the prophets and apostles have written, and that which is taught them by the Comforter through the prayer of faith (DC 52:9), and Say nothing but repentance unto this generation (DC 6:9).
Joseph Smith
“Strive not about the mysteries of the kingdom; cast not your pearls before swine, give not the bread of the children to dogs, lest you and the children should suffer, and you thereby offend your righteous Judge.” (Teachings of the Prophet, p. 77)
Joseph Smith
“Declare the first principles, and let mysteries alone, lest ye be overthrown. Never meddle with the visions of beasts and subjects you do not understand. Elder Brown, when you go to Palmyra, say nothing about the four beasts, but preach those things the Lord has told you to preach about—repentance and baptism for the remission of sins.” (Teachings of the Prophet, p. 292)]