The Small but Hugely Powerful Book that has Helped Millions of People. Your Invisible Power is one of the earliest and most inspirational books of 'New Thought.' It is small in size but huge in stature as well as in the impact it has had on millions of people. It teaches you, in simple terms, how to effectively use the power of visualization for your own betterment. Reading this easy to read book may be one of the most enlightening experiences you may ever have.