No one can say, "Jesus is Lord," except by the Holy Spirit. —1 Corinthians 12:3
Paul tells us that when the Father welcomed Jesus home, the same God who said that He would not give His glory to another has either changed His mind or has recognized Jesus to be very God of very God when He bestowed on Jesus the name that is above every name.
It is therefore a direct reference to the honor that Jesus deserved; it is a direct reference to the character of Jesus, as it was to the character of God. It is a direct reference to the reputation that Jesus deserved and to the worship that He deserved.
He, who stooped so low, now took upon Himself, from the Father, the honor above all others. He was given the name that was above every name. He who emptied Himself is now lifted up to the glorious ranks of equality with God and enjoyment of that dignity, which was ever His by right, but to which He never clung. Now it is given to Him as His personal possession. Meekness—majesty!
Paul puts it very carefully, showing that God gave the name for one reason only.
God has given this name to Jesus so that at the very name of Jesus, every knee should bow and every tongue confess that Jesus Christ is Lord.
The Holy Spirit confesses that Jesus is Lord. This is the very foundation of the Christian faith; it is the lowest common denominator. By this you may know whether or not you are a Christian. If you believe this, not in your head, but in your heart, you are a Christian, and if you do not, you are not. And if you do, it is not because you have done anything spectacular. As the psalmist put it in Psalm 115:1, "Not to us, O Lord, not to us but to your name be the glory." It is all because the Holy Spirit has enabled us to see the truth that Jesus is Lord.
Excerpted from Meekness and Majesty (Christian Focus Publications Ltd., 1992, 2000).