John 6:60 On hearing it, many of his disciples said, “This is a hard teaching. Who can accept it?”
 From this time many of his disciples turned back and no longer followed him.
Why did Jesus choose such an offensive illustration?  “For my flesh is real food and my blood is real drink.
 Whoever eats my flesh and drinks my blood remains in me, and I in him.”
I think verse 65 is the key:
 He went on to say, “This is why I told you that no one can come to me unless the Father has enabled him.”
For salvation to come, a person must have:
1. A heart that is looking,
2. A willingness to set self aside,
3. And an intention to follow Jesus.
Peter spoke for the group when he said, “Lord, to whom shall we go? You have the words of eternal life. We have come to believe and to know that you are the Holy One of God.”
How did they come to believe? Verses 37, 39, 44, and 65 tell us that the Father reveals Who Jesus is to those who would receive Him. It sounds like “Limited Atonement,” but verses 51, 54 and 56 say, “Whoever.” Life in Jesus is available to all–who will come. Many choose not to. Jesus doesn’t meet their criteria for what they think they need. Even one of the 12 (Judas) fit this category and proved it later on.
Preach the Word-no restraints–and pray for the Spirit to move in hearts.