The sermon explores the calling of Levi, a despised tax collector, to illustrate Jesus' mission to seek and save the lost. By examining Mark chapter 2, the text highlights how Jesus associated with sinners rather than avoiding them, challenging the self-righteousness of the Pharisees. The central message emphasizes that spiritual sickness requires a physician, meaning Christ came specifically for those aware of their sin, not the self-deemed righteous. This narrative demonstrates the boundless nature of divine grace, which reaches even the lowest depths of human corruption to offer redemption. Ultimately, the preacher urges listeners to abandon any pretense of personal holiness and run to the cross as sick sinners in need of salvation.