Holy Spirit Prayer of Saint Augustine,
Saint Augustine (354-430) created this poetic prayer to the Holy Spirit:

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.