On Holy Trinity Sunday, the Church completes its journey through the mysteries of the liturgical year and names the God who accomplished them all. This reflection draws on Paul's soaring doxology from Romans — "O the depth of the riches of the wisdom and of the knowledge of God" — and the Introit's cry of mercy from Tobit, to show that Trinity Sunday is first and foremost an act of worship, not a theology lecture. Saint Gregory of Nazianzus (Fifth Theological Oration) illuminates how God revealed himself progressively across salvation history so the light of the Trinity could "shine upon the more illuminated," while Saint Augustine (De Trinitate, Book I) unpacks Paul's three prepositions as a Trinitarian signature written into the heart of Scripture. The Gospel's nighttime conversation with Nicodemus anchors the mystery in the sacramental life of every baptized soul.

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