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Most Holy Trinity -

The ultimate end of the whole divine economy is the entry of God's creatures into the perfect unity of the Blessed Trinity. But even now we are called to be a dwelling for the Most Holy Trinity: "If a man loves me, "says the Lord, "he will keep my word, and my Father will love him, and we will come to him, and make our home with him":

O my God, Trinity whom I adore,
help me forget myself entirely
so to establish myself in You,
unmovable and peaceful
as if my soul were already in eternity.
May nothing be able to trouble my peace
or make me leave You,
O my unchanging God,
but may each minute
bring me more deeply
into Your mystery!
Grant my soul peace.
Make it Your heaven,
Your beloved dwelling
and the place of Your rest.
May I never abandon You there,
but may I be there, whole and entire,
completely vigilant in my faith,
entirely adoring,
and wholly given over
to Your creative action.

Catechism of the Catholic Church, Par. 260, 1997, 2565

The mystery of the Most Holy Trinity is the central mystery of the Christian faith and of Christian life. God alone can make it known to us by revealing himself as Father, Son, and Holy Spirit.

Catechism of the Catholic Church, Par. 261

The Incarnation of God's Son reveals that God is the eternal Father and that the Son is consubstantial with the Father, which means that, in the Father and with the Father, the Son is one and the same God.

Catechism of the Catholic Church, Par. 262

The mission of the Holy Spirit, sent by the Father in the name of the Son (Jn 14:26) and by the Son "from the Father" (Jn 15:26), reveals that, with them, the spirit is one and the same God. "With the Father and the Son he is worshipped and glorified" (Nicene Creed).

Catechism of the Catholic Church, Par. 263

The Holy Spirit proceeds from the Father as the first principle and, by the sternal gift of this to the Son from the communion of both the Father and the Son" (St. Augustine, De Trin. 15, 26, 47, PL 42:1095)

Catechism of the Catholic Church, Par. 264

By the grace of Baptism "in the name of the Father and of the Son, and of the Holy Spirit," we are called to share in the life of the Blessed Trinity, here on earth in the obscurity of faith, and after death in eternal light (Cf. Paul VI, CPG 9).

Catechism of the Catholic Church, Par. 265

"Now this is the Catholic faith: We worship one God in the Trinity and the Trinity in unity, without either confusing the persons or dividing the substance; for the person of the Father is one, the Son's is another, the Holy spirit's another; but the Godhead of the Father, Son, and Holy Spirit is one, their glory equal, their majesty coeternal." (Athanasian Creed; DS 75; ND 16).

Catechism of the Catholic Church, Par. 266

Inseparable in what they are, the divine persons are also inseparable in what they do. But within the single divine operation each shows forth what is proper to him in the Trinity, especially in the divine missions of the Son's Incarnation and the gift of the Holy Spirit.

Catechism of the Catholic Church, Par. 267