Exegesis of John 6, "Bread of Life Discourse" After he first after broke with the Catholic Church, Martin Luther still held to the Catholic teaching of John 6. Luther continued to teach that Jesus, in the extended "Bread of Life" discourse, was being utterly literal in equating his own salvific body and blood with the Eucharist later instituted at the Last Supper. Sometime later in his career, Luther changed his mind, and seeing the discourse (especially the later part, verses 61-65) dealt with the necessity of faith, declared the discourse was really about salvific faith in Christ quite apart from any sacramental usage. Luther continued to teach the Real Presence of Christ in the Eucharist (Lutheran "co-substantiation"), holding Jesus' declarations at the Last Supper and Paul's Eucharisti