The term "cornerstone" holds significant theological and symbolic meaning within the Christian tradition, rooted deeply in both the Old and New Testaments. In ancient construction practices, the cornerstone was the principal stone, placed at the corner of a building to guide the builders. It was essential for the stability and alignment of the entire structure.

Old Testament References

The concept of the cornerstone is first introduced in the Old Testament, where it is often used metaphorically to signify strength and foundation. In Isaiah 28:16, the prophet declares, "So this is what the Lord GOD says: 'See, I lay a stone in Zion, a tested stone, a precious cornerstone, a sure foundation; the one who believes will never be shaken.'" This passage highlights the cornerstone as a symbol of security and trustworthiness, pointing to God's provision and the establishment of His kingdom.

Psalm 118:22 also references the cornerstone: "The stone the builders rejected has become the cornerstone." This verse, while initially reflecting Israel's experience, prophetically points to the coming Messiah, who would be rejected by many yet become the foundation of God's redemptive plan.

New Testament Fulfillment

In the New Testament, the cornerstone imagery is explicitly applied to Jesus Christ, affirming His central role in God's salvific work. In Matthew 21:42, Jesus Himself cites Psalm 118:22, saying, "Have you never read in the Scriptures: 'The stone the builders rejected has become the cornerstone. This is from the Lord, and it is marvelous in our eyes'?" Here, Jesus identifies Himself as the cornerstone, rejected by the religious leaders but chosen by God as the foundation of the new covenant.

The Apostle Peter further elaborates on this in Acts 4:11, proclaiming, "This Jesus is 'the stone you builders rejected, which has become the cornerstone.'" Peter emphasizes that salvation is found in no one else, underscoring the exclusivity and sufficiency of Christ as the cornerstone of faith.

Paul also addresses this theme in Ephesians 2:19-20, where he writes, "Therefore you are no longer strangers and foreigners, but fellow citizens with the saints and members of God’s household, built on the foundation of the apostles and prophets, with Christ Jesus Himself as the cornerstone." This passage illustrates the unity and growth of the Church, with Christ as the essential foundation that holds the entire spiritual edifice together.

Theological Significance

Theologically, the cornerstone represents Christ's preeminence and authority in the Church and the believer's life. As the cornerstone, Jesus is the measure by which all doctrine and practice are aligned. His life, death, and resurrection are the basis for the believer's faith and the Church's mission.

The rejection of the cornerstone by the builders serves as a warning against unbelief and disobedience. It calls believers to recognize and submit to Christ's lordship, ensuring that their lives are built upon the solid foundation of His teachings and sacrifice.

In summary, the cornerstone is a profound biblical metaphor that encapsulates the person and work of Jesus Christ. It signifies His foundational role in God's redemptive plan and the establishment of His eternal kingdom.