And this food is called among us the Eucharist, of which no one is allowed to partake but the man who believes that the things which we teach are true, and who has been washed with the washing that is for the remission of sins, and unto regeneration, and who is so living as Christ has enjoined. For not as common bread and common drink do we receive these; but in like manner as Jesus Christ our Saviour, having been made flesh by the Word of God, had both flesh and blood for our salvation, so likewise have we been taught that the food which is blessed by the prayer of His word, and from which our blood and flesh by transmutation are nourished, is the flesh and blood of that Jesus who was made flesh. For the apostles, in the memoirs composed by them, which are called Gospels, have thus delivered unto us what was enjoined upon them; that Jesus took bread, and when He had given thanks, said, This do in remembrance of Me, Luke 22:19 this is My body; and that, after the same manner, having taken the cup and given thanks, He said, This is My blood; and gave it to them alone. Which the wicked devils have imitated in the mysteries of Mithras, commanding the same thing to be done. For, that bread and a cup of water are placed with certain incantations in the mystic rites of one who is being initiated, you either know or can learn.
Saint Justin Martyr, First Apology
Justin Martyr was born in Flavia Neapolis, ancient Shechem, modern day Nablus, in Judaea circa 100 AD. He was brought up a pagan. Having enough money to pursue the study of philosophy, he encountered the teachings of Christ, after a long and methodical search for the true philosophy, and became a convert. Having found the true philosophy, he traveled around the Roman Empire, spreading it, garbed in his philosopher’s gown. Eventually he settled in Rome. He wrote eight treatises defending Christianity. His best known work is his First Apology which he addressed to the Roman Emperor Antonius Pius, one of the best of the emperors, who reigned from 138-161 AD. This Apology was a plea for the Emperor to stop persecuting the Christians. In this Apology he gives us many details as to how Catholics worshiped in Rome during the middle of the Second Century. His description of the Eucharist is a treasure for all Catholics as it demonstrates how closely the Church has maintained this sacrament to the ritual followed in the early Church.