Trinity Sunday

Almighty everlasting God, who granted to Your servants, in the profession of the true Faith, to recognize the glory of the eternal Trinity and to adore Its Unity in the might of majesty: we beseech You; that, in the steadfastness of that same Faith, we may always be defended from all adversities.

What do we, as Catholics, the Church, believe about the Holy Trinity? Much, in fact. Here are three paragraphs from the Catechism of the Catholic Church:

"The mystery of the Most Holy Trinity is the central mystery of Christian faith and life. It is the mystery of God in himself. It is therefore the source of all the other mysteries of faith, the light that enlightens them. It is the most fundamental and essential teaching in the 'hierarchy of the truths of faith'. [GCD 43.] The whole history of salvation is identical with the history of the way and the means by which the one true God, Father, Son and Holy Spirit, reveals himself to men 'and reconciles and unites with himself those who turn away from sin'. [GCD 47.]" (CCC 234)

 "The Trinity is a mystery of faith in the strict sense, one of the 'mysteries that are hidden in God, which can never be known unless they are revealed by God'. [Dei Filius 4: DS 3015.] To be sure, God has left traces of his Trinitarian being in his work of creation and in his Revelation throughout the Old Testament. But his inmost Being as Holy Trinity is a mystery that is inaccessible to reason alone or even to Israel's faith before the Incarnation of God's Son and the sending of the Holy Spirit." (CCC 237)

"The whole divine economy is the common work of the three divine persons. For as the Trinity has only one and the same natures so too does it have only one and the same operation: 'The Father, the Son and the Holy Spirit are not three principles of creation but one principle.' [Council of Florence (1442): DS 1331; cf. Council of Constantinople II (553): DS 421.] However, each divine person performs the common work according to his unique personal property. Thus the Church confesses, following the New Testament, 'one God and Father from whom all things are, and one Lord Jesus Christ, through whom all things are, and one Holy Spirit in whom all things are'. [Council of Constantinople II: DS 421.] It is above all the divine missions of the Son's Incarnation and the gift of the Holy Spirit that show forth the properties of the divine persons." (CCC 258)