The Prophet Joseph Smith on the Principle of Revelation:

"Salvation cannot come without revelation, it is in vain for anyone to minister without it."

  8 August 1839

"Where there is a prophet, a priest or a righteous man unto whom God gives His Oracles, there is the Kingdom of God; and where the Oracles of God are not, there the Kingdom of God is not."

 22 January 1843

"Jesus in his teaching says upon this rock I will build My church and the gates of hell shall not prevail against it.  What rock?  Revelation."

22 January 1843

"A man is saved no faster than he gets knowledge, for if he does not get knowledge he will be brought into captivity by some evil power in the other world-- as evil spirits will have more knowledge, and consequently more power, than many men who are on the earth.   Hence, it needs Revelation to assist us and give us knowledge of the things of God."

 10 April 1844

"We must have revelations then, and we can see that the doctrine of revelation as far transcends the doctrine of no revelation as knowledge is above ignorance; for one truth revealed from heaven is worth all the sectarian notions in existence."  

 10 March 1844