The sermon centers on the sobering reality that not all who appear to be followers of Christ are truly His, using Judas Iscariot as the ultimate example of a false disciple who was chosen yet ultimately rejected. Through a detailed examination of the Gospels, particularly John's account of the Last Supper, it emphasizes that Judas left the meal before the institution of the Lord's Supper, indicating he was never truly united with Christ, as Jesus had foretold that one of the twelve was a devil. The passage underscores the doctrine of definite atonement—Christ's sacrifice was not for every person in a universal sense, but specifically for those the Father has given Him, those who are truly His sheep. The sermon warns against a superficial faith, affirming that only those who recognize their spiritual poverty, hunger for righteousness, and are humbled by grace are truly worthy to partake in the Lord's Supper. It concludes with a call to self-examination, rooted in the Beatitudes, reminding believers that true worthiness comes not from self-righteousness but from grace-driven repentance and faith.