In his crucial writing on the Latin Mass of 1532, Dr. Luther gives his "amen" to certain prayers that the celebrant may pray, all with the altering of the first person singular to plural (thus ruling out of bounds the private mass). It seems to me a crying shame that these have largely been lost to our typical Lutheran practice. They include the following:
O Lord Jesus Christ, Son of the living God, who through the will of the Father and the co-operation of the Holy Ghost, didst through thy death give life to the world: deliver us by this thy most sacred body and blood from all our iniquities, and from all evils: and make us ever to cleave to thy commandments; nor ever suffer us to be separated from thee: who with the Father and the Holy Ghost livest and reignest with God, world without end. Amen.
And after communing:
What we have taken with our lips, O Lord, may we with pure minds receive; and from a temporal gift, may it become to us an everlasting remedy.
May Thy body [and Thy blood] which we have received cleave to our inmost parts: and grant that no stain of sin may remain in us whom this pure and holy sacrament hath refreshed, O thou who livest and reignest with the Father and the Holy Ghost world without end. Amen.