Trinity Sunday

The Most Holy Trinity

Trinity Sunday, a movable feast also known as Holy Trinity Sunday, is celebrated a week after Pentecost Sunday in honor of the most fundamental of Christian beliefs—belief in the Holy Trinity. We can never fully understand the mystery of the Trinity, but we can sum it up in the following formula: God is three Persons in one Nature. The three Persons of God—Father, Son, and Holy Spirit—are all equally God, and They cannot be divided.

Quick Facts

• Date: The Sunday after Pentecost Sunday.
• Type of Feast: Solemnity.
• Readings: Deuteronomy 4:32-34, 39-40; Psalm 33:4-5, 6, 9, 18-19, 20, 22; Romans 8:14-17; Matthew 28:16-20
• Prayers: The sign of the Cross; The Glory Be; The Athanasian Creed
• Other Names for the Feast: The Solemnity of the Most Holy Trinity, Holy Trinity Sunday