Ancient Prayer to St. Joseph for Purity (Virginum Custos et Pater)

Guardian of virgins, and holy Father Joseph, to whose faithful keeping Christ Jesus, Innocence itself, and Mary, Virgin of virgins, were committed: I pray and beseech thee, by these dear pledges, Jesus and Mary, that, being preserved from all uncleanness, I may with spotless mind, pure heart, and chaste body, ever serve Jesus and Mary most chastely all the days of my life. Amen.