Why is Christ considered the headstone of the corner?

The title 'headstone of the corner' ascribed to Christ emphasizes His foundational role in the Church and salvation history. In the sermon, references are made to Psalm 118:22-23, which states that 'the stone which the builders refused has become the headstone of the corner.' This indicates that though Jesus was rejected by men, He was chosen by God to fulfill His purpose. As the cornerstone, Jesus supports the entire structure of the faith and binds believers together as His body, the Church. This metaphor illustrates not only His significance in God's plan but also His strength and stability—the cornerstone is essential for the integrity of the whole building. Therefore, acknowledging Christ as the headstone is to recognize Him as the sole source of spiritual life and the fulfillment of God's promises.