Omnipotens sempiterne Deus, ecce accedo ad sacramentum unigeniti Filii tui, Domini nostri, Iesu Christi; accedo tamquam infirmus ad medicum vitae, immundus ad fontem misericordiae, caecus ad lumen claritatis aeternae, pauper et egenus ad Dominum caeli et terrae. Rogo ergo immensae largitatis tuae abundantiam, quatenus meam curare digneris infirmitatem, lavare foeditatem, illuminare caecitatem, ditare paupertatem, vestire nuditatem; ut panem Angelorum, Regem regum et Dominum dominantium, tanta suscipiam reverentia et humilitate, tanta contritione et devotione, tanta puritate et fide, tali proposito et intentione, sicut expedit saluti animae meae. Da mihi, quaeso, Dominici Corporis et Sanguinis non solum suscipere sacramentum, sed etiam rem et virtutem sacramenti. O mitissime Deus, da mihi Corpus unigeniti Filii tui, Domini nostri, Iesu Christi, quod traxit de Virgine Maria, sic suscipere, ut corpori suo mystico merear incorporari, et inter eius membra connumerari. O amantissime Pater, concede mihi dilectum Filium tuum, quem nunc velatum in via suscipere propono, revelata tandem facie perpetuo contemplari: Qui tecum vivit et regnat in unitate Spiritus Sancti, Deus, per omnia saecula saeculorum. Amen.
Prayer of St. Thomas Aquinas before Holy Communion
'I come as one sick to the physician of life, as one unclean to the source of all mercy, as one blind to the light of the eternal sun' — the preparation for Communion printed in every Roman Missal since 1570.
Almighty and eternal God, behold I approach the Sacrament of Thine only-begotten Son, our Lord Jesus Christ. I come as one sick to the physician of life, as one unclean to the source of all mercy, as one blind to the light of the eternal sun, as one poor and needy to the Lord of heaven and earth. I beseech Thee, therefore, out of the abundance of Thine immense goodness, deign to heal my infirmity, cleanse me from my sins, illumine my blindness, enrich my poverty, clothe my nakedness. Grant that I may receive the Bread of angels, the King of kings, the Lord of lords, with as much reverence and humility, contrition and devotion, purity and faith, with such uprightness of purpose and intention, as may be profitable to the salvation of my soul. Grant me, I beseech Thee, to receive not only the Sacrament of the Lord's body and blood, but also the grace and virtue of the Sacrament. O most merciful God, grant me so to receive the body of Thy only Son, our Lord Jesus Christ, which He took from Mary ever virgin, that I may merit to be incorporated into His mystical body, and numbered amongst His members. O most loving Father, grant that Thy beloved Son, Whom, now hidden beneath the sacramental veil, I propose to receive, I may at length contemplate forever, face to face: Who with Thee liveth and reigneth in the unity of the Holy Ghost, God, world without end. Amen.
Before Mass and Holy Communion; by priests in the Praeparatio ad Missam of the Missal.
This is the prayer the Roman Missal has placed before the priest's Mass, among the Orationes ante Missam, since the Missal of Pius V (1570), under Thomas's name. It is built on four pairs: sick and physician, unclean and fountain, blind and light, poor and Lord of heaven and earth; and it asks not merely to receive the sacrament but 'the grace and virtue of the sacrament' — the res sacramenti of Thomas's own theology of the Eucharist.
Its authorship is traditional rather than proved, but it has been Thomas's in the Church's use for seven centuries, and the last sentence — to see unveiled the Son we now receive 'hidden beneath the sacramental veil' — is the same movement as his Adoro te devote. The English is that of Blessed Be God (1925).
