1.33 God is one, and at the same time he is three. Isn’t that nonsense?
God exists as Father, Son, and Holy Spirit. This concept of the Trinity means that the one God is present to us in three different ways, namely as three persons that love us very much.
The loving relationship between the three persons of the Trinity shows us what God is in his essence: love. However, we will never be able to completely comprehend this mystery...
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The Wisdom of the Church
Is Jesus God? Does he belong to the Trinity?
Jesus of Nazareth is the Son, the second divine person mentioned when we pray, “In the name of the Father and of the Son and of the Holy Spirit” (Mt 28:19).
Jesus was either an imposter who made himself lord of the sabbath and allowed himself to be addressed with the divine title “lord”—or else he was really God. The scandal came when he forgave sins. In the eyes of his contemporaries, that was a crime deserving death. Through signs and miracles, but especially through the resurrection, his disciples recognized who Jesus is and worshipped him as Lord. That is the faith of the Church. [Youcat 39]
This is what the Church Fathers say
We acknowledge a God, and a Son his Logos (=Word), and a Holy Spirit, united in essence, - the Father, the Son, the Spirit, because the Son is the Intelligence, Reason, Wisdom of the Father, and the Spirit an effluence, as light from fire. [Athenagoras, A plea for the Christians, Chap. 24 (MG 6, 945)]
