7.  Then having sanctified ourselves by these spiritual Hymns, we beseech the merciful God to send forth His Holy Spirit upon the gifts lying before Him; that He may make the Bread the Body of Christ, and the Wine the Blood of Christ In the Liturgy of St. James the Triumphal Hymn is followed by the ‘Recital of the work of Redemption,’ and of ‘the Institution,’ by the ‘Great Olbation,’ and then by the ‘Invocation,’ as follows:  “Have mercy upon us, O God, after Thy great mercy, and send forth on us, and on these gifts here set before Thee, Thine all-holy Spirit,.…that He may come, and by His holy, good, and glorious advent (παρουσίᾳ) may sanctify this Bread and make it the holy Body of Thy Christ (Amen), and this Cup the precious Blood of Thy Christ” (Amen).  In Cat. xix. 7, Cyril calls this prayer “the holy Invocation of the Adorable Trinity,” and in xxi. 3, “the Invocation of the Holy Ghost.”; for whatsoever the Holy Ghost has touched, is surely sanctified and changed.