The true approach (not for prayer as D&C 9 was) was in scripture: But when they shall lead you, and deliver you up, take no thought beforehand what ye shall speak, neither do ye premeditate: but whatsoever shall be given you in that hour, that speak ye: for it is not ye that speak, but the Holy Ghost. (Mark 13:11) And it came to pass that Nephi and Lehi did preach unto the Lamanites with such great power and authority, for they had power and authority given unto them that they might speak, and they also had what they should speak given unto them (Helaman 5:18) And it shall be given thee in the very moment what thou shalt speak AND WRITE (D&C 24:6) The science of it is clear. Royal Skousen: Joseph Smith is not the author of the Book of Mormon, nor is he actually the translator. Instead, he was the revelator: through him the Lord revealed the English-language text (by means of the interpreters, later called the Urim and Thummim, and the seer stone). Such a view is consistent, I believe, with Joseph’s use elsewhere of the verb translate to mean ‘transmit’ and the noun translation to mean ‘transmission’ (as in the eighth Article of Faith). (link)