The Secret is defined as the law of attraction, which is the principle that "like attracts like." It is called "the most powerful law in the universe," and it is working all the time. "What we do is we attract into our lives the things we want, and that is based on what we're thinking and feeling."
The principle explains that we create our own circumstances by the choices we make in life. And the choices we make are fueled by our thoughts—which means our thoughts are the most powerful things we have here on earth.
I am now a millionaire, own a mansion, have a loving spouse, a great family, and a life full of abundance. This happened because I believed in The Secret.