St. Ephraim begins the second half of his great prayer "Give rather a spirit of chastity, humility, patience and love to Thy servant." Asking God to take our sinful passions away is followed by a petition to give us virtue, chastity being first in the order. In the Fathers, and especially St. John Climacus, we find that the virtues (which are in truth the energies of the Holy Spirit) act in our heart and are active through us through the deeds of the body surrendered to Christ. And chastity, rather than being limited to some quaint notion of sexual purity (true enough), is the virtue of wholeness in Christ which enables us to fight the passions fervently.