This book delves into the central theme of belief and unbelief in the Gospel of John, examining how the concepts of faith, doubt, and spiritual blindness shape the narrative and the identity of Jesus as the Son of God. Henderson explores the contrasts between those who recognize Jesus as the Messiah and those who reject Him, using detailed analysis of key passages, characters, and encounters. The work reflects on the nature of true belief as presented in the Gospel and how it is intimately connected with eternal life and spiritual transformation. The book also addresses the profound theological implications of faith and its role in salvation, illustrating how belief in Jesus goes beyond mere intellectual assent and involves a deep, personal relationship with the Divine. With a focus on the conversations, signs, and miracles that reveal Jesus' identity, this study offers both a theological and historical perspective on the nature of faith and the transformative power of belief in the Gospel of John.