The Most Holy Trinity — the Supreme Mystery of Catholic Faith is beyond our explanation, yet the Church calls us still to make it the fruitful ground of our prayerful reflection.
With help from the Catechism, I’ll give it a go.
From Matthew’s Gospel, Jesus commands that we baptize “in the name of the Father and of the Son and of the Holy Spirit.”
Notice He does not say in the “names” of Father, Son, and Spirit, for there is only One God, the Almighty Father, His Only Son, and Their Life-giving Holy Spirit - the Holy Trinity.
As God’s Self-revelation this is the central mystery of Christian Faith and Life.
It is the mystery of God Himself — as the Source of all other Mysteries of the Catholic Faith, and the Light which enlivens and enlightens them all.
The whole History of Salvation is identical with the history of the way and the means by which our One True God is revealed to us.
As Father, Son, and Holy Spirit, God reconciles and unites us by His Grace, leading us toward Himself and away from sin.
It is challenging, to say the least, to reflect upon the inner life of love shared in the Three Persons — and then even more how the effective works of God’s creation, redemption, and sanctification allows us to share in His Eternal Life, His Selfless Love, and His Dynamic Inspiration.
The Sacred Mystery of God is mirrored in us, as His Creatures, as His Beloved Children, and as Bearers of His Life & Love to the world.
Glory & praise to YOU, O Holy Triune Unity!

Fr. Bob Burkemper