The sermon addresses the question of whether baptism is a prerequisite for salvation, arguing against the notion that adding works, such as baptism, to faith diminishes Christ's sacrifice on the cross. Drawing from passages like Acts 2:38, Mark 16:16, and 1 Peter 3:21, the message emphasizes that salvation is attained through grace by faith in Jesus Christ, not through religious rituals. The preacher cautions against private interpretations that contradict established biblical teachings, asserting that true salvation stems from belief in Christ's completed work and that baptism is an outward expression of an already established faith, representing a renewed life and separation from the world.