James Allen read this book at the age of 24. It acted as his spiritual awakener and started him on his path to "perfect peace".
Of this book he said:
"I could not rise from my seat until I had read the last word. When I did rise from the reading of this book it was as though I had become a different man. A curtain seemed to have rolled back from the face of the universe, and I saw the causes and meanings of things which had hitherto been dark mysteries. There was a revelation which was almost blinding in its brilliance and suddenness; an exaltation which alarmed me, while it transported me into felicitous insight. The vision quickly faded but its influence remained, the memory of it saving me in many an hour of darkness and temptation, until that calmer time of meditation and knowledge, ten years later, when it returned, never again to fade from me."