The Gospel of John was written to persuade people to believe in Jesus (20:30-31). The opening verses declare that Jesus is God, stressing his unique relationship with God the Father. The book focuses on seven of Jesus' signs (miracles), to show his divinity. Jesus called people to believe in him, promising eternal life. He proved he could give life by raising Lazarus (ch. 11) and by his own death and resurrection. John features Christ's seven "I am" statements, his encounters with Nicodemus and the Samaritan woman, his Upper Room teachings and washing of the disciples' feet (chs. 13-16), and his high priestly prayer (ch. 17). It includes the most well-known summary of the gospel (3:16). The author was probably the apostle John, writing about a.d. 85.