Come Holy Spirit, fill the hearts of your faithful and kindle in them the fire of your love. Send forth your Spirit, and they shall be created, and you shall renew the face of the earth.
O God, who by the light of the Holy Spirit, did instruct the hearts of the faithful, grant that by the same Holy Spirit we may be truly wise and ever enjoy God's consolations. We ask this through Christ our Lord. Amen.
Breathe in me, O Holy Spirit, that my thoughts may all be holy.
Act in me, O Holy Spirit, that my work may be holy.
Fill my heart, O Holy Spirit, that I may love that which is holy.
Strengthen me, O Holy Spirit, that I may defend that which is holy.
Guard me, then, O Holy Spirit, that I may always be holy. Amen.
-- Prayer of St. Augustine, Bishop of Hippo, Africa
For more prayers to the Holy Spirit, visit http://www.catholic.org/prayers/prayer.php?p=912