St. John was born in Bethsaida, and like his brother James, was a fisherman. He was called while mending his nets to follow Jesus. He became the beloved disciple of Jesus. He wrote the fourth Gospel, three Epistles and the Apocalypse. His passages on the pre-existence of the Word, who by His Incarnation became the light of the world and life of our souls, are among the finest of the New Testament.
He is the evangelist of the divinity of Christ and His fraternal love. With James, his brother and Simon Peter, he was one of the witnesses of the Transfiguration. At the Last Supper, he leans on the Master's breast. At the foot of the cross, Jesus entrusts His Mother to his care. John's pure life kept him very close to Jesus and Mary. In years to come John was exiled to the island of Patmos under Emperor Domitian, but lived to an old age. — From the Daily Roman Missal