From what we can draw from the Scriptures relative to the teaching of heaven, Joseph Smith taught, “we are induced to think that much instruction has been given to man since the beginning which we do not possess now. This may not agree with the opinions of some of our friends who are bold to say that we have everything written in our Bible which God ever spoke to man since the world began, and that if he had ever said anything more we should certainly have received it. But we ask, does it remain for a people who never had faith enough to call down one scrap of revelation from heaven, and for all they have now are indebted to the faith of another people who lived hundreds and thousands of years before them, does it remain for them to say how much God has spoken and how much He has not spoken?
We have what we have, and the Bible contains what it does contain: but to say that God never said anything more to man than is there recorded, would be saying at once that we have at last received a revelation: for it must require one to advance thus far, because it is nowhere said in that volume by the mouth of God, that He would not, after giving what is there contained, speak again; and if any man has found out for a fact that the Bible contains all that God ever revealed to man he has ascertained it by an immediate revelation, other than has been previously written by the prophets and apostles.” (Teachings, p. 61.)