Christian unity: There is one body and one Spirit, just as you were called to one hope when you were called. Ephesians 4:4

The unity of all Christians in the same spirit is at the beginning of the same faith in Jesus Christ, the Lord, according to the gospel of John, prayed for the unity of all his disciples to God: "I pray that they will all be one, just as you and I are one—as you are in me, Father, and I am in you" John 17:21.
And this blessing of the unity, which results in communion, is a clear sign of the christian spiritual maturity, because when people's souls are not divided, the society among them is not divided either. Because the factions or divisions that are a work of the flesh (Galatians 5:19-21) occur because souls, above all, are in struggle with themselves, reason desires one thing, passion desires another, and thus each brother turns his back on the other, due of unpredictability and selfishness. In other words, the spiritual love (Agape), Thomas Aquinas taught, is a force of union, but concupiscence is division.
The apostle Paul in his epistle to the Ephesians returned to the theme of the spiritual unity of the believers, calling Christians to remember the importance of the spiritual gift of eternal life (contemplative activity), which is one, just as all Christians make up a single spiritual body with Jesus as head.
With these wise words, the apostle Paul gave his teaching:
"Do your best to preserve the unity which the Spirit gives by means of the peace that binds you together. There is one body and one Spirit, just as you were called to one hope when you were called; one Lord, one faith, one baptism; one God and Father of all, who is over all and through all and in all" Ephesians 4:3-6.
For Paul, unity was a consequence of sincere faith and the intimate understanding of the mysteries of the Kingdom of God, the empire or dominion of the divine perfections.

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