John 6:60-68

Therefore many of His disciples, when they heard this said, “This is a difficult statement; who can listen to it?” But Jesus, conscious that His disciples grumbled at this, said to them, “Does this cause you to stumble? What then if you see the Son of Man ascending to where He was before? It is the Spirit who gives life; the flesh profits nothing; the words that I have spoken to you are spirit and are life. But there are some of you who do not believe.” For Jesus knew from the beginning who they were who did not believe, and who it was that would betray Him. And He was saying, “For this reason I have said to you, that no one can come to Me unless it has been granted him from the Father.” As a result of this many of His disciples withdrew and were not walking with Him anymore. So Jesus said to the twelve, “You do not want to go away also, do you?” Simon Peter answered Him, “Lord, to whom shall we go? You have words of eternal life.