“The Trinity is the mystery of God in three Persons: Father, Son and Holy Spirit. The revealed truth of the Holy Trinity is at the very root of the Church’s living faith.”
Catechism of the Catholic Church
SUNDAY, MAY 31: It’s been one week since Pentecost, and for Western Christians, this marks Trinity Sunday. A celebration of the Christian doctrine of the Trinity—the Father, the Son and the Holy Spirit—Trinity Sunday is celebrated across Western liturgical churches. Though the early Church observed no specific day for the Holy Trinity, Thomas Becket (1118-70 CE) helped spread the observance of such a day across Western Christendom when he said that the day of his consecration would be held as a new festival for the Holy Trinity. Still, a day set aside solely for the Holy Trinity continued to vary by Sunday in several regions until Pope John XXII accepted the festival into the official calendar of the Western Church, in 1334 CE.
Note: The Thursday following Trinity Sunday is observed as the Feast of Corpus Christi. In some countries, this feast may be moved to the following Sunday.
According to Christian tradition: Following the Ascension of Jesus and Pentecost, Christians regard that the Holy Trinity has been fully revealed. Last week, signs of the Holy Spirit were evident in red banners, roses and doves; this week, vestments are white and a new season begins. The shamrock and viola tricolor pansy symbolize the Trinity, and in some churches, the Athanasian Creed is recited or read. (Learn more from Catholic Culture and Fish Eaters.)
Did you know? The Preface of the Trinity that is frequently read on Trinity Sunday is the same one that was in the first text of the Sacramentary of St. Gregory the Great.
ACTIVITIES & MORE
Families, youth groups and others can teach St. Augustine’s simplified explanation of the Trinity to children today, as is suggested by Women for Faith & Family. Children can also go outdoors to search for shamrocks and pansies, or prepare a dinner with cloverleaf rolls and a three-in-one fruit salad. The table may be decorated with a “Trinity” candle, and a vase of collected tri-petal wildflowers.