What does John 6:70 mean?

Peter's statement in the last few verses proclaimed Jesus as divine (John 6:68–69). This is one of the seven "witnesses" to Jesus' divine nature given in the gospel of John. Most people walked away from Jesus, abandoning His teachings when they became hard to accept (John 6:60, 66). Peter did not. His reasoning for this is both simple and straightforward: there is no other source for truth, so how could he look anywhere else (John 6:68–69)?

And yet, in his declaration, Peter made a faulty assumption. His statement used the term "we," which in that context means the inner circle of twelve men learning from Christ. But this group includes Judas Iscariot, who would eventually become a traitor and betray Jesus to His death.

Other Scripture points out that Jesus knew the real motives of everyone around Him (John 2:24–25; Mark 2:8). This is what allowed Him to say plainly that the people who sought Him out in Capernaum weren't there for truth. They were there for free food (John 6:26). God's reasons for doing what He does, or allowing what He allows, are ultimately His alone. Christ knows that Judas is not really a believer, but He has kept Him in the inner circle to complete His mission.