The document discusses the 'New Thought' movement, which emerged in the early 19th century as a spiritual and metaphysical philosophy affirming the unity of God and humanity, emphasizing positive thinking and mental healing. Key figures such as Phineas P. Quimby, Ralph Waldo Emerson, and Mary Baker Eddy contributed to its development, with New Thought being a reaction against the prevailing Calvinistic beliefs of the time. The movement evolved into various organizations and schools, promoting the idea that mental states influence reality and emphasizing the importance of love and healing in everyday life.