The Holy Trinity

Almighty and eternal God,
you have given your servants
who confess of the true faith
the duty to acknowledge
the glory of the eternal Trinity,
and to worship the true Unity
in the power of the divine majesty.
Keep us steadfast in this faith,
and always defend us from all adversities;
for you, Father, Son, and Holy Spirit,
live and reign,
one God, now and forever.

Source: Historic Collect for the Holy Trinity, Late Gregorian