Catholic Catechism
Who Is God?
God is the Supreme Being, and above Him there is no other. God is the source of all that is and He is above all that exists. God is a mystery that the human mind could have difficulties trying to fathom, but a mystery that none-the-less exists as there is proof that he does exist. In that one god, there are three persons; God the Father, God the Son and God the Holy Spirit.
Ref. CCC 300, Acts 17: 24-25
Taken From The Compendium – Catechism Of The Catholic Church
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