Missionary Roy Sietmann

Preaching Service

The sermon centers on the urgent call to spiritual vigilance, drawing from Mark 8:14–21 to warn against the insidious influence of 'leaven'—the hypocrisy of the Pharisees and the self-centered ambition of Herod—that can subtly infiltrate the hearts of believers. Through personal testimony of missionary service in Zacatecas, Mexico, the speaker illustrates how both cultural religion and worldly ambition can distort spiritual focus, even within the church, while emphasizing the need to prioritize eternal souls over earthly concerns. The message calls the congregation to a deeper, more authentic faith marked by selfless service, constant spiritual discernment, and a life dedicated to Christ's glory rather than personal legacy or religious performance. The preacher urges a heartfelt examination of one's own heart, inviting repentance and renewed commitment to see the world through God's eyes, especially in light of ongoing missions work and the spiritual battle for souls. Ultimately, the sermon is a pastoral exhortation to live with open eyes, not blinded by outward appearances or self-promotion, but fixed on the eternal purpose of redeeming lost lives.