Lord, I am not worthy to be a guest at your holy table, yet I have heard the sweet words of your invitation, and you have promised me forgiveness of my sins through your body and blood which I eat and drink in this sacrament. O dear Lord, I know that your divine Word and promise are true. I do not doubt them, and resting on them, I eat and drink with you. Let it be to me according to your Word.
Source: Attributed to Martin Luther, no German original found in Die Gebete Luthers, from The Collection of Baron Bunsen, p. 182 #3 Tr. Catherine Winkworth.
Version in traditional English by Catherine Winkworth:
Lord Jesu Christ, though of a truth I am not worthy that Thou shouldest come under my roof, yet am I in sore need of Thy help, and desirous of Thy grace, that I may attain godliness and salvation. I come now in no other confidence than this, that I have heard the sweet words wherewith Thou invitest me to Thy table, and dost promise me, unworthy though I be, forgiveness of my sins through Thy body and blood, which I eat and drink in this Sacrament. O dear Lord, I know that Thy Divine word and promise are true; I doubt them not; and, resting on them, I eat and drink with Thee. Be it unto me according to Thy word. Amen.
A Collection of Prayers 