But the one who really first articulated the Law as general principle was Prentice Mulford. Mulford, a pivotal figure in the development of New Thought thinking, discusses the Law of Attraction at length in, for example, his essay "The Law of Success", published 1886-1887. In this, Mulford was followed by other New Thought authors, such as Henry Wood (starting with his God’s Image in Man, 1892), and Ralph Waldo Trine (starting with his first book, What All the World's A-Seeking, 1896). For these authors, the Law of Attraction is concerned not only about health but every aspect of life.
My first thought after reading this book was how comforting it was to me. Almost like a parent scooping you up in a hug and saying "It's going to be alright. I've got your back. Here is what we are going to do." I know that may sound silly, but I got more out of this book than any religious type of thing, philosophy etc. (and I'm not religious in the traditional sense). After life's normal trials and tribulations in the past, what I took away from it was like a big clue or door opening into how all of life, both present, future and beyond, works. Gives detailed exercises (& a lot of them) to do/put into practice to get the Law of Attraction (aka LOA) into action working in your life AND how to get rid of the negative things, habits or thinking in your life. So it's not just a "philosophy", but a" how to" book as well. At least it spoke to me in terms that resonated.