John 21:25
But there are also many other things that Jesus did; if every one of them were written down, I suppose that the world itself could not contain the books that would be written. But these are written so that you may come to believe that Jesus is the Messiah, the Son of God, and that through believing you may have life in his name — the Gospel's closing hyperbola (the world could not contain the books) emphasizes the inexhaustibility of Jesus' significance. The infinite surplus of his deeds suggests that no narrative can exhaust his meaning or contain his reality. This volta back to the purpose statement (echoing 20:31) reaffirms that John's Gospel is theological and evangelistic interpretation, not exhaustive chronicle, written to generate faith and eternal life.