"The preacher needs to realize that God's Word is not the preacher's word. He is to recognize himself as a messenger, not an originator (1 Thess. 2:13). He is a sower, not the source (Matt. 13:3, 19). He is a herald, not the authority (1 Tim. 2:7). He is a steward, not the owner (Col. 1:25). He is the guide, not the author (Acts 8:31). He is the server of spiritual food, not the chef (John 21:15, 17)."
John MacArthur, Biblical Doctrine, p. 133.