St. John's Gospel was likely written between 90-100 AD in Ephesus. It has a very simple yet profound style that appeals to both new and mature Christians. The Gospel aims to show that Jesus is the Messiah and Son of God and that belief in him leads to eternal life. Some key themes are light versus darkness, belief, love, and witnessing. The Gospel contains 7 signs that point to Jesus' identity and is accompanied by long discourses. The Upper Room discourse focuses on Jesus comforting the disciples, promising the Holy Spirit, discussing their relationship to him as the vine, and including the High Priestly Prayer.