The Secret is all about the law of attraction. Rhonda took an ancient concept and broke it down into a way to condition yourself to be a more positive thinker. Without bringing religion into it, she effectively made the belief in Karma even more popular. You can see the ties into Karma, without her mentioning it. Inward and outward positivity creates good Karma therefore attracting positive energy, people, and outcomes.
I didn't read the entire book cover to cover, but I skimmed a few chapters and read thoroughly a few more. A lot of exercises in there of what most witches already know haha!
But overall good for negative people who don't know how to change and become more positive.