The purpose of the Gospel of John is evangelism, that men would believe and be saved:
John 20:31 but these are written so that you may believe that Jesus is the Christ, the Son of God, and that by believing you may have life in His name.
Peter knew that Jesus had the Words of eternal life, as recorded when disciples quit following Jesus because the Truth became too much for them, and Jesus asked, “Do you want to go away as well?”
John 6:68 Simon Peter answered him, "Lord, to whom shall we go? You have the words of eternal life,
The reality is, men either are, or were in darkn