O God, you have taught us to keep all your commandments by loving you and our neighbor: Grant us the grace of your Holy Spirit, that we may be devoted to you with our whole heart, and united to one another with pure affection; through Jesus Christ our Lord, who lives and reigns with you and the Holy Spirit, one God, for ever and ever. Amen.
Or the 4th Sunday of Trinitide
To celebrate and reflect on the Trinity the last stanza of St. Patrick’s ode or poem called St. Patrick’s Breast Plate
I bind unto myself today
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, 372-466 CE