The sermon "How to Know the Truth in a World of Noise" from Dwell City Church, based on John 7:14-24, emphasizes the importance of discerning truth amidst cultural and religious influences. The speaker asserts that humans are designed for community and can be swayed by societal trends, including past moral failings like slavery, or modern ones such as a growing disinterest in marriage. He outlines three key ways to navigate this "noise": relying on God's word through dedicated study (micro, macro, and community reading), rejecting counterfeits by testing messages against biblical truth, and judging with right judgment by recognizing both physical and spiritual realities. The sermon warns against self-serving interpretations of faith, exemplified by the Pharisees' legalism, and stresses the need for personal accountability to God's unchanging word.