St. Augustine of Hippo (354-430 AD) was an early Christian theologian and Bishop. He was converted to Christianity at the age of 32 through the prayers and tears of his mother St. Monica. He is a Doctor of the Church and his Feast Day is on August 28th. He is the Patron of Brewers, Theologians an Students. Here is a prayer written by St. Augustine.
Breathe in me, O Holy Spirit, that my thoughts may all be holy.
Act in me, O Holy Spirit, that my work, too, may be holy.
Draw my heart, O Holy Spirit, that I love but what is holy.
Strengthen me, O Holy Spirit, to defend all that is holy.
Guard me, then, O Holy Spirit, that I always may be holy. Amen.