A Pure Heart

O God Almighty, Father of our Lord Jesus Christ, Thine only begotten Son, give me a body unstained, a pure heart, a watchful mind, and an upright understanding, and the presence of Thy Holy Spirit, that I may obtain and ever hold fast to an unshaken faith in Thy Truth, through Jesus Christ, Thy Son, our Lord; through whom be glory to Thee in the Holy Ghost, forever and ever. Amen. —The Clementine Liturgy.