O merciful God,
to study prudently,
to understand rightly,
and to fulfill whatever is pleasing to you perfectly,
to the praise and glory of your name.
You are the King of glory, O Christ.
You are the everlasting Son of the Father.
Source: Thomas Aquinas, d. 1274
Source of this version: Freely modified from Prayers of the Middle Ages, edited by J. Manning Potts, 1954.