Eph 2:19-22, 19 Now, therefore, you are no longer strangers and foreigners, but fellow citizens with the saints and members of the household of God, 20 having been built on the foundation of the apostles and prophets, Jesus Christ Himself being the chief cornerstone, 21 in whom the whole building, being fitted together, grows into a holy temple in the Lord, 22 in whom you also are being built together for a dwelling place of God in the Spirit.
This is the message: we have a new identity with access to the Father and to all the rooms. We the Gentiles have been brought near and made fellow-citizens of the kingdom of God with the saints. We have been built into the temple of the Lord. The word of God, declared by apostles and prophets, is the foundation of our faith.
Jesus is the chief cornerstone. The cornerstone is the first stone set in the construction of a masonry foundation. All other stones will be set in reference to this stone, thus determining the position of the entire structure. It further forms the base of a corner of a building, joining two walls. Christ joined the Jews and the Gentiles in the building. He is the foundation-stone on which the building rests, and the stone of union.
Without Jesus we would be strangers and foreigners, with no foundation to build on. Everything would be crooked and weak. There would be no growth or unity or built together for the dwelling of the Holy Spirit. This is very true, “You will never know if Jesus is all you need until Jesus is all you have. And when Jesus is all you have, then and only then you discover He is all you need” (bible commentator).
“I have a great need for Christ: I have a great Christ for my need.” Charles H. Spurgeon.