Why is the Gospel considered a command rather than an invitation?

According to the sermon, Jesus treats the Gospel as a proclamation rather than a mere invitation—this is illustrated in Matthew 7:6 where He warns against giving what is holy to dogs or casting pearls before swine. This reflects the sovereign nature of God's call to repentance and faith; it is not simply an offer for men to accept but a command from the King of Heaven. In His authority, Jesus calls all men everywhere to bow and acknowledge Him as Lord. The truth of the Gospel places absolute demands on our lives, aligning with Reformed theology that emphasizes God's sovereignty in salvation and the necessity of a transformed heart to respond to His call.