Trinity Sunday celebrates the Christian doctrine of the Trinity, the three Persons of God: the Father, the Son, and the Holy Spirit.
I bind unto myself the name,
The strong name of the Trinity;
By invocation of the same.
The Three in One, and One in Three,
Of whom all nature hath creation,
Eternal Father, Spirit, Word:
Praise to the Lord of my salvation,
salvation is of Christ the Lord.
St. Patrick’s Breastplate, Translation: Cecil Frances Alexander