John 6:63 It is the Spirit who gives life; the flesh is no help at all. The words that I have spoken to you are spirit and life.
Joh 6:64 But there are some of you who do not believe.” (For Jesus knew from the beginning who those were who did not believe, and who it was who would betray him.)
Joh 6:65 And he said, “This is why I told you that no one can come to me unless it is granted him by the Father.”
Joh 6:66 After this many of his disciples turned back and no longer walked with him.
Joh 6:67 So Jesus said to the twelve, “Do you want to go away as well?”
Joh 6:68 Simon Peter answered him, “Lord, to whom shall we go? You have the words of eternal life,
Joh 6:69 and we have believed, and have come to know, that you are the Holy One of God.”
Joh 6:70 Jesus answered them, “Did I not choose you, the twelve? And yet one of you is a devil.”
Joh 6:71 He spoke of Judas the son of Simon Iscariot, for he, one of the twelve, was going to betray him.
Peter answered Jesus' question; "Do you want to go away as well?" "Lord, to whom shall we go? You have the words of eternal life." He had the words of life and he was the substitute sacrifice to give us eternal life. No one else ever spoke the word of God and was raised from the dead, proving that he is the Son of God. Peter filled with the Holy Spirit spoke out following the resurrection of Jesus.
Act 4:8 Then Peter, filled with the Holy Spirit, said to them, “Rulers of the people and elders,
Act 4:9 if we are being examined today concerning a good deed done to a crippled man, by what means this man has been healed,
Act 4:10 let it be known to all of you and to all the people of Israel that by the name of Jesus Christ of Nazareth, whom you crucified, whom God raised from the dead—by him this man is standing before you well.
Act 4:11 This Jesus is the stone that was rejected by you, the builders, which has become the cornerstone.
Act 4:12 And there is salvation in no one else, for there is no other name under heaven given among men by which we must be saved.”
Only Jesus could give to us the forgiveness of sins and eternal life.
1Jn 5:11 And this is the testimony, that God gave us eternal life, and this life is in his Son.
1Jn 5:12 Whoever has the Son has life; whoever does not have the Son of God does not have life.
Come to Jesus with sorrow for your sins and ask him to forgive you. Whosoever believes in him shall have eternal life.