In the Old and New Testament, Jesus Christ is called the chief cornerstone. He quoted the Old Testament verse in the gospels when referring to Himself.
Jesus said to them, “Have you never read in the Scriptures: ‘The stone which the builders rejected Has become the chief cornerstone. This was the Lord’s doing, And it is marvelous in our eyes’? Matthew 21:42
Jesus also quotes this verse in Mark 12:10-11; when quoting the verse in Luke chapter 20, Jesus describes the result of accepting or rejecting this chief cornerstone;
Then He looked at them and said, “What then is this that is written: ‘The stone which the builders rejected has become the chief cornerstone’? “Whoever falls on that stone will be broken; but on whomever it falls, it will grind him to powder.” Luke 20:17-18
The consequences of accepting or rejecting Jesus Christ are either coming to Him as the Great Physician Who heals the terminally ill sinner that has cast himself upon the merciful God of glory, or rejecting the Judge of all the earth, Who suddenly comes to execute God’s wrath on those who despise God and exult in unrighteousness. We cannot idly ignore who Jesus Christ is and then expect to escape the consequences of that choice, when adding His warning in Luke 18, Jesus makes that option impossible.
When intimating that He Himself is the chief cornerstone, Jesus Christ is quoting from Psalm 118, which is one of many Messianic Psalms.
The stone which the builders rejected Has become the chief cornerstone. This was the Lord’s doing; It is marvelous in our eyes. This is the day the Lord has made; We will rejoice and be glad in it. Psalm 118:22-24
He quoted the verses making reference to who He is. Verse 24 points ahead to His unique work that He did performing the will of the Father on the behalf of lost sinners. The day the Lord has made is the day of salvation and references the gospel. The day of His death was the day that He won the victory over sin, death, and devil by taking away the written ordinances and nailing them to the cross because He fulfilled the law perfectly and took the punishment we deserve for our sins when He suffered and died on the cross shedding His blood for the remission of our sins; receiving the wrath of God that we deserve. The day the Lord has made refers also to His resurrection from the dead proving Him to be the Messiah and the only Savior of mankind.
Then Peter, filled with the Holy Spirit, said to them, “Rulers of the people and elders of Israel: If we this day are judged for a good deed done to a helpless man, by what means he has been made well, let it be known to you all, and to all the people of Israel, that by the name of Jesus Christ of Nazareth, whom you crucified, whom God raised from the dead, by Him this man stands here before you whole. This is the ‘stone which was rejected by you builders, which has become the chief cornerstone.’ Nor is there salvation in any other, for there is no other name given among men by which we must be saved.” Acts 4:8-12
And He opened their understanding, that they might comprehend the Scriptures. Then He said to them, “Thus it is written, and thus it was necessary for the Christ to suffer and to rise from the dead the third day, and that repentance and remission of sins should be preached in His name to all nations, beginning at Jerusalem. Luke 24:45-47
It is the Scriptures that He has fulfilled that bear witness to Him. The Word of God reveals our glorious Messiah to us, the Savior of our souls.
The church of Jesus Christ is built upon the revelation of Himself in His glorious Word the Bible.
Now, therefore, you are no longer strangers and foreigners, but fellow citizens with the saints and members of the household of God, having been built on the foundation of the apostles and prophets, Jesus Christ Himself being the chief cornerstone, in whom the whole building, being fitted together, grows into a holy temple in the Lord, in whom you also are being built together for a dwelling place of God in the Spirit. Ephesians 2:19-22
When Paul went on his many missionary journeys he always reasoned from the Scriptures concerning the Messiah, that Jesus is the Christ. Likewise, our hope in Jesus Christ as our Savior must be founded upon the Scriptures, which is the Word of God. We must never place our confidence in Christ based upon the futile reasoning and imagination of sinful man.
Now when they had passed through Amphipolis and Apollonia, they came to Thessalonica, where there was a synagogue of the Jews. Then Paul, as his custom was, went in to them, and for three Sabbaths reasoned with them from the Scriptures, explaining and demonstrating that the Christ had to suffer and rise again from the dead, and saying, “This Jesus whom I preach to you is the Christ.” And some of them were persuaded; and a great multitude of the devout Greeks, and not a few of the leading women, joined Paul and Silas. Acts 17:1-4
Then the brethren immediately sent Paul and Silas away by night to Berea. When they arrived, they went into the synagogue of the Jews. These were more fair-minded than those in Thessalonica, in that they received the word with all readiness, and searched the Scriptures daily to find out whether these things were so. Acts 17:10-12
We need to daily read the Bible, and study it for our own edification and for the strengthening of others. As we study the Scriptures, relying upon the Holy Spirit, He opens our minds to see the marvelous wonders of our glorious Savior, Jesus Christ. We can have sweet fellowship with our wonderful loving Lord as we meditate upon His Word and consider Him. He can speak to us, correct us, and lead us in the way that we should go as our faithful merciful Shepherd.
We too, as we come to the chief cornerstone, the Author of our salvation, are as the living stones of the living God and are being built up together, as a spiritual house for our God.
Therefore, laying aside all malice, all deceit, hypocrisy, envy, and all evil speaking, as newborn babes, desire the pure milk of the word, that you may grow thereby. If indeed you have tasted that the Lord is gracious. Coming to Him as to a living stone, rejected indeed by men, but chosen by God and precious, you also, as living stones, are being built up a spiritual house, a holy priesthood, to offer up spiritual sacrifices to God through Jesus Christ. Therefore it is also contained in the Scripture, “Behold I lay in Zion A chief cornerstone, elect, precious, And he who believes on Him will by no means be put to shame.” Therefore, to you who believe He is precious; but to those who are disobedient, “The stone which the builders rejected Has become the chief cornerstone.” And “A stone of stumbling And a rock of offense.” They stumble, being disobedient to the word, to which they also were appointed. But you are a chosen generation, a royal priesthood, a holy nation. His own special people, that you may proclaim the praises of Him who called you out of darkness into His marvelous light; who once were not a people but are now the people of God, who had not obtained mercy but now have obtained mercy. 1 Peter 2:1-10
We see again that Jesus Christ is the chief cornerstone as proclaimed in the Scriptures, and it is to the Scriptures that we must resort so we may grow as believers and also proclaim the wonderful glory of our Great God and Savior, the Lord Jesus Christ. Our clinging to our Lord Jesus Christ and believing what He says to us in His Word the Bible is what differentiates us from unbelievers and deceivers. We have fallen upon this great stone for salvation, eternal life and for glory, though by so doing we prove ourselves to be broken and needy sinners. Be that as it may, trusting in Jesus Christ, we will never be put to shame.