God appears in the mind of a physicist and an existentialist in a puzzling manner, which creates shock and astonishment that the scientist cannot overcome for the rest of his life. Since then he gets confused about finding answers about the true nature of the reality and the mystery of the existence of God. A highly creative person, with wide knowledge in many fields of science and arts, grapples all his life to understand these personal experiences, which defy all scientific knowledge and reason. Whenever he manages to harness enough doubts and attempts to get rid of the supernatural world, which keeps his life a captive of a weird mental phenomenon that cannot be understood by any intellectual reasoning, God appears again and again. He gives messages with such clarity of “illumination” that all defenses of reason, which a scientist may erect with his intellectual capacity, fall apart. Judging from scientific perspective many neurologists would like to interpret such mental phenomenon as caused by abnormal brain activities, and explain God as a delusion rising from malfunctioning of the brain. The book will throw lights upon the questions: “Do these experiences represent a case of a brain damage, resulting in wrong neural circuitry, which generate the messages of God in the mind, or does there truly exist God, who is beyond intellectual comprehension of even a very sophisticated human mind? After experiencing continuous dilemma and conflicts for more than fifty years the nuclear scientist and a cosmologist, who was a believer of the western existential philosophy in his young age, remains at bay without finding any convincing answer. This book reveals a hidden world which has disturbed, puzzled and created agony and despair on one side, and illumined the mind with knowledge and vision, not accessible through intellectual process of the mind, on the other hand. It is a story of pain and joy, suffering followed by profound ebullience of a spirit which is one with the cosmos and resides in us.