John lived to be very old. He witnessed the destruction of Jerusalem and the ruin of the stately temple. The last survivor of the disciples who had been intimately connected with the Saviour, his message had great influence in setting forth the fact that Jesus was the Messiah, the Redeemer of the world. No one could doubt his sincerity, and through his teachings many were led to turn from unbelief.

Johannes nåede en meget høj alder. Han var vidne til Jerusalems ødelæggelse og tilintetgørelsen af det prægtige tempel. Som den sidste overlevende af de disciple, der havde kendt Frelseren indgående, havde hans budskab stor betydning ved forkyndelsen af den kendsgerning, at Jesus var Messias og verdens Frelser. Ingen kunne være i tvivl om hans oprigtighed og gennem hans undervisning blev mange ført til at omvende sig fra vantroen.