Now you are the body of Christ and individually members of it. (1 Corinthians 12:27)
“And therefore throughout all time, man, formed at the beginning by the Hands of God, that is, by the Son and the Spirit, becomes after the image and likeness of God: the chaff, that is, the apostasy, being cast away, while the wheat, that is, those who bear as fruit faith in God being gathered into the granary. And therefore tribulation is necessary for those who are being saved, that, in a certain way, having been threshed and kneaded together, through endurance, with the Word of God, and baked in the fire, they may be suitable for the banquet of the King, as one of ours said, when condemned to the wild beasts because of his testimony to God: ‘I am the wheat of Christ, and I am ground by the teeth of the wild beasts, that I may be found [to be] pure bread of God.’ (Irenaeus)
The perspective of this passage is oriented towards the fashioning of man in the image and likeness of God. Man, formed in the beginning by the Word and the Spirit, is continually being fashioned throughout all time into the image and likeness of God. We have seen how God bore the apostasy of man, that man might come to learn of his own mortality and acknowledge the one and only Source of life. Here the process of fashioning man into the image, salvation, is described from a different perspective: threshed by tribulation, the chaff or apostasy being cast away, man is kneaded together with Christ, and through fire the martyr is made into bread suitable for the Father’s celebration.
Just as Christ’s death and resurrection are the basis on which Christians celebrate the eucharist, so the martyr’s death, kneaded together with the Word, and resurrection, as appropriate bread, are celebrated by God. (John Behr, Asceticism and Anthropology in Irenaeus and Clement, p. 78)