He sent Him so that men, having received reconciliation with the Father and adoption to God through the Son, might be called and be children of God.
He sent Him so that, keeping the commandments of God, they might inherit eternal life.
In the Gospel, the Theologian says of Jesus Christ: "He came to His own, and His own did not receive Him.
But to those who received Him, who believed in His name, He gave power to become children of God" (Jn 1:11-12).
These "were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God" (Jn 1:13).
In another place he says: "These things are written that you may believe that Jesus is the Christ, the Son of God, and that believing you may have life in His name" (Jn 20:31).
"The world does not know us, because it did not know Him."
By the world, the Apostle means the Jews and Gentiles who do not believe in Christ.
Those also belong to the world who, though called Christians, either believe wrongly in Christ or do not live according to the spirit of Christ's teaching.
For this reason, like those who do not believe in Christ, they do not know the dignity of true Christians and become their enemies.
The Apostle added this to resolve perplexity and to comfort and strengthen Christians amid sorrowful trials.
How often people are perplexed when they see the sorrows and misfortunes of Christ's faithful followers.
How often, seeing the sorrows of pious men, they say or think to themselves: "Where is God's favor toward them?
How is it evident that they are near to God and children of God, when they are so offended, so humiliated, and persecuted?"
The Apostles, as the first followers of Christ, were the first to experience this contempt and humiliation from the world.
Therefore Saint John says in his own person: "The world does not know us, because it did not know Him."
It is as though he says: do not be troubled when you see or experience that the world hates, offends, and persecutes us.
It does this because it does not know God. It does not know the great gifts of God imparted to believers.
It does not know that we are children of God, whose dignity consists not in outward advantages, but in inward and spiritual perfections proper to those born of God.
The world judges by outward advantages. Whoever is rich, powerful, and glorious, the world honors and exalts.
But we, as children of God, are humble and meek. We have no worldly riches, seek no glory, and possess no outward force or authority.
Therefore the world so humiliates us.