Pastor Tony Silveira's sermon on 1 Corinthians 3 addresses the immaturity of the church in Corinth, highlighting the need for spiritual growth beyond basic teachings. He emphasizes the importance of building on the foundation of Jesus Christ and warns that the quality of one's work for God will be tested by fire, determining future rewards. Silveira stresses that destroying the church is a serious offense, equating arrogance and divisiveness with spiritual failure, and calls for humility and a deep relationship with God.