The fourth, and last, of the Gospels is that of John. It was written about 50 years after Jesus' ascension by the last surviving of His disciples, the apostle John; "the disciple who Jesus loved".
At the time John was writing, the Christian faith had spread and its followers were suffering at the hands of the Roman government. Despite this, John still hoped to spread the good news about Jesus, as He had commanded His disciples after His resurrection. As John says:
John 20:31
"but these are written, that ye might believe that Jesus is the Christ, the Son of God; and that believing ye might have life through his name."
John 16:5-11
"But now I go my way to him that sent me; and none of you asketh me, Whither goest thou? But because I have said these things unto you, sorrow hath filled your heart. Nevertheless I tell you the truth; It is expedient for you that I go away: for if I go not away, the Comforter will not come unto you; but if I depart, I will send him unto you. And when he is come, he will reprove the world of sin, and of righteousness, and of judgment: of sin, because they believe not on me; of righteousness, because I go to my Father, and ye see me no more; of judgment, because the prince of this world is judged"