Keith Simons teaches on Psalm 1, emphasizing the distinction between the truly happy person and the ungodly. He explains that true happiness comes from rejecting the counsel of the wicked and delighting in God's law, which leads to a fruitful and prosperous life. Simons contrasts this with the fate of the ungodly, who may appear successful but are ultimately like chaff, lacking substance and destined to perish. The sermon highlights the importance of meditating on God's word and living according to His ways for true fulfillment. Simons encourages listeners to understand the King James Version to deepen their faith and comprehension of biblical teachings.