I first learned of Neville Goddard from the writings of Mitch Horowitz, an historian of America's occult. He is a big fan of Neville (who taught and wrote using only his first name) and this book was the catalyst that brought Horowitz into Neville's orbit.
Neville (who died in 1972) was a New Thought mystic who was quite popular during his lifetime. He fell out of favor until the advent of the Internet and YouTube, where his taped lectures have been posted (like Mystery Science Theater 3000's "Keep Circulating the Tapes!" motto, Neville allowed people to tape his lectures for free and now his talks are popping up everywhere, giving Neville's ideas a new lease). New Thought developed during the late 19th and early 20th centuries in the US and Neville is among the last of these philosophers. That movement has now evolved into the Law of Attraction (LOA) best personified by The Secret, that was very popular in the early Aughts.
Apparently Neville's ideas and philosophy has revived (I was familiar with New Thought but Neville had gotten by me). The first thing to be aware of in his work is that it is grounded in an unorthodox view of Scripture. Biblical quotes are liberally sprinkled throughout his writing, and his main point is that the human imagination is God - literally - and our thoughts create our world.
I'm surprised at the traction he has in today's world, as I wouldn't think his work would have much appeal to non-Christians, and his view of the Bible would be unacceptable to evangelical Christians and conservative Catholics. But he's out there, people are into him, and I think his ideas are certainly worth exploring.
This book is a collection of pamphlets that Neville wrote and serve as an excellent introduction to his thinking. I would encourage all those interested in broadening their own thinking to give Neville a try.