Law of Attraction Defined

As I lead different workshops people say they have heard of the Law of Attraction but don't know what it is exactly. I recently attended an Abraham-Hick's workshop and I liked the way that they defined the law of attraction in their catalog.

"The Law of Attraction says: That which is like unto itself, is drawn...When you say, "Birds of a feather flock together," you are actually talking about the Law of Attraction. You see it evidenced when when you wake up feeling unhappy, and throughout the day things get worse, and at the end of the day you say, "I shouldn't have gotten out of bed." You see the Law of Attraction evidenced in your society when you see that the one you speaks most of illness has illness; when you see the one who speaks most of prosperity has prosperity... The Law of Attraction is evident when you set your radio dial on 630AM and expect to receive the broadcast from the transmitting tower of 630AM, because you understand the radio signals between the transmitting tower and your receiver must match. As you begin to understand-or better stated, as you begin to remember-this powerful Law of Attraction, the evidence of it, which surrounds you will be easily apparent, for you will begin to recognize the exact correlation between what you have been thinking about and what is actually coming about into your experience. Nothing merely shows up in your experience. You attract it, all of it, no exceptions." "The Universal Law of Attraction", Esther and Jerry Hicks, The Law of Attraction