CCC 245
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The apostolic faith concerning the Spirit was confessed by the second ecumenical council at Constantinople (381): "We believe in the Holy Spirit, the Lord and giver of life, who proceeds from the Father." Nicene Creed; cf. DS — Denzinger–Schönmetzer (Enchiridion Symbolorum). By this confession, the Church recognizes the Father as "the source and origin of the whole divinity". Council of Toledo VI (638): DS — Denzinger–Schönmetzer (Enchiridion Symbolorum). But the eternal origin of the Spirit is not unconnected with the Son's origin: "The Holy Spirit, the third person of the Trinity, is God, one and equal with the Father and the Son, of the same substance and also of the same nature. . . Yet he is not called the Spirit of the Father alone,. . . but the Spirit of both the Father and the Son." Council of Toledo XI (675): DS — Denzinger–Schönmetzer (Enchiridion Symbolorum). The Creed of the Church from the Council of Constantinople confesses: "With the Father and the Son, he is worshipped and glorified." Nicene Creed; cf. DS — Denzinger–Schönmetzer (Enchiridion Symbolorum).
Read the full chapter 1. I Believe in God the Father ¶198–421