The brother missionaries, Nephi and Lehi, had miraculous results when preaching the word of God because they had authority from God to preach and then spoke the words that God gave them through the Holy Spirit.
…They did preach with great power, insomuch that they did confound many…dissenters…insomuch that [the dissenters] came forth and did confess their sins and were baptized unto repentance…And…Nephi and Lehi did preach…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 5:17-18)
Questions:
-Who has a line of priesthood authority to preach that goes directly back to Jesus Christ?
-How does one rely on the Holy Spirit so that the words spoken, when preaching, are given by God?