What is the true gospel according to the sermon?

According to the sermon, the true gospel is often misunderstood in modern contexts; it primarily highlights the sovereignty of Christ as the reigning Lord rather than focusing solely on His love or the notion that He desires to save everyone. This message calls sinners to acknowledge the supreme authority of Christ, the need for repentance from sin, and the importance of coming to faith in Him. The sermon underscores that belief in a reigning Lord brings about genuine conviction of sin and a heartfelt response to the call of the gospel as demonstrated in Acts 2, where Peter's preaching led to repentance among the listeners.