New Thought is an umbrella term for multiple progressive faith philosophies. The fundamental premise of New Thought is two-fold. First, there is only one creative source for all that exists, everything that is is not only a part of it, everything IS it. Second, the entire Universe of expression is the effect to an Infinite cause, and all things come into being based on an immutable law of cause and effect.
The history of New Thought can be traced back to the works of Phineas Parkhurst Quimby, the Transcendentalist Movement (specifically the work of Ralph Waldo Emerson), even the words of Jesus and Plato. These seemingly disparate sources all point to a common idea: Love is the most powerful force for creation that exists.
The development of New Thought has resulted in three major movements that fall under the New Thought umbrella: Unity, Religious Science, and Divine Science.