<human>:  Why did John write his gospel?
<bot>: John wrote his gospel to prove that Jesus was the Messiah. He believed that Jesus was the Son of God, and he wanted to show that Jesus was the Messiah, who was prophesied to come. John was a disciple of Jesus, and he had a unique perspective on Jesus' life. He wrote his gospel to convince others of the truth of Jesus' teachings, and he wrote his gospel to convince people to follow Jesus.