Almighty and everlasting God, Behold we approach the sacrament of the passion of Thy only begotten Son, our Lord Jesus Christ. As sick, we come to the physician of life; as unclean to the fountain of mercy; as blind, to the light of eternal splendor; as needy, to the Lord of heaven and earth. We pray Thee of Thine infinite mercy to heal our sickness, to wash our foulness, to lighten our darkness, and to enrich our poverty; that receiving the Body and Blood of Thy dear Son, we may be incorporated into His mystical body, and ever be reckoned among his members; who with thee and the Holy Ghost liveth and reigneth One God, world without end. AMEN
I do not know where I first came across this wonderful prayer, but it has been part of my preparations for Holy Communion for several years.