For my part I was first attracted by the first volume of letters of fire, and then I bought the second, and then the cards. In fact I would say it is rather a continuity not know if the opposite is also strong. As with other reviews about the books, I stand by my position to say that these are very powerful tools that allow us when we are diligent to cleanse, eliminate without that we have specially working on it, negative behaviors same for us. Personally I notice that there bc changes since I started reading the first volume (November 2012), it is sometimes subtle, but it is. So here to fire cards, I recommend them.