Edit: who could he be referring to in this passage? He describes the Bread of Life narrative as many of His disciples follow him no more because they did not understand what he said accept in a "material sense", few remain behind, for, as St. Peter affirms, "thou hast the words of eternal life". There was another, easily comparable to certain parties within the Church today, who were less sincere than those who didn't believe and left and those who believed and stayed.
There was one who stayed and did not believe, like the LCWR nuns. It's difficult not to see in their refusal to be sincere "the mark of the devil":
Finally, Jesus knew that even among the twelve apostles there was one that did not believe: Judas. Judas could have left, as many of the disciples did; indeed, he would have left if he were honest. Instead he remained with Jesus. He did not remain because of faith, or because of love, but with the secret intention of taking vengeance on the Master. Why? Because Judas felt betrayed by Jesus, and decided that he in turn would betray Him. Judas was a Zealot, and wanted a triumphant Messiah, who would lead a revolt against the Romans. But Jesus had disappointed those expectations. The problem is that Judas did not go away, and his most serious fault was falsehood, which is the mark of the devil. This is why Jesus said to the Twelve: “One of you is a devil” (John 6.70). We pray to the Virgin Mary, help us to believe in Jesus, as St. Peter did, and to always be sincere with Him and with all people.
Link to the Angelus Address....
