Here, God's people have rejected following His example in order to practice and live by lies that bring only destruction and death.
Notice the contrast to us as shown by Jesus in the New Testament. Revelation 19:11 testifies of Him, "Then I saw heaven opened, and behold, a white horse. And He who sat on him was called Faithful and True, and in righteousness He judges and makes war." Jesus says of Himself in John 14:6, "I am the way, the truth, and the life." This statement confirms the faithfulness of His nature: He is reliable, trustworthy, and of unwavering integrity.
What does being trustworthy mean in practical application? Who does God show are the most important persons to the overall welfare of the community, state, or nation? It is not the doctors, lawyers, politicians, or businessmen but the preacher and the king because they should teach, administer, exemplify, and provide the values upon which the community will function. God expects those values to be His.
What does God consistently show in His Word? Notice the context in which these verses appear. In both Deuteronomy and Revelation, a new culture, a new nation, is either being established or about to be established. God is indicating that the preacher has a slight edge in importance.
When God established Israel as a nation, He first appointed and sent the preacher—the prophet Moses. In the New Testament, Christ came first as a rabbi, a preacher to teach the way of God. Upon His resurrection, He became our High Priest, a post that has both religious and administrative functions, and He will return as King to administer God's Kingdom. This is why God's Word places so much importance on these two community positions. The preacher should exemplify God's values and deliver instruction containing them, and the king should live them and administer them to the nation.
Without true values, civilization will soon descend into revolution and anarchy. God's doctrine is true and faithful. It will produce gently and without corruption, or as Moses puts it in Deuteronomy 32:2, it will "drop as the rain" and "distill as the dew," whereas a hard-driving rain destroys. Any society or family built on God's doctrines will prosper and become great.