How do we know that Jesus is the cornerstone of the church?

Jesus is declared the cornerstone of the church through prophetic affirmation in Isaiah 28:16, which Peter cites in 1 Peter 2:6. The significance of Jesus as the cornerstone lies in His unique role as the chosen, precious stone laid by God. The church, being built upon this foundation, indicates that all who believe in Him are supported by His sovereign grace. This teaching counters any notion that human leaders, such as Peter or the Pope, serve as foundational figures, solidifying the truth that Christ alone sustains and defines His church.