In this book, Sundar Singh puts down the visions that the Lord had given him. Sundar felt that his religious pursuits in Sikhism and the questioning of Christian and Hindu priests left him without ultimate meaning. Sundar resolved to kill himself by throwing himself upon a railroad track. He asked that whosoever is the 'True God' would appear before him, or else he would kill himself; that very night he had a vision of Jesus who opened Sundar's soul to the truth. Sundar announced to his father that henceforth he would follow Christ. His father denounced him, and his brother attempted to poison him. He was not poisoned just once but a number of times. People of that area threw snakes in his house.

But his life was saved by the help of a nearby Christian community. Many miracles were performed by Sundar Singh and many people in Asia converted to Christ under his ministry. Sadhu Sundar Singh is treasured by many as a formative figure in the development of the Christian church in India.