In the context of his conversation with the Samaritan woman the Johannine Jesus says "the true worshipers will worship the Father in Spirit and truth" (4:23). In this monograph Benny Thettayil undertakes a detailed exegetical study of the fourth evangelist's understanding of 'worship in Spirit and truth'. Part One is devoted to a detailed exegetical analysis of John 4:19-26 focusing on the relationship between Jews and Samaritans, the meaning of pneuma and aletheia as well as the question whether Jesus reveals himself as the Messiah to the Samaritan woman. In Part Two Thettayil offers an extensive study of the replacement theme in the Fourth Gospel. He studies this issue in connection with the Johannine community and with the presentation of Jesus as the fulfilment of the temple. In his final chapter Thettayil enters into the difficult field of "Johannine Replacement Theology", taking up the challenge of confronting the theological implications of the way the fourth evangelist presents judaism.