What is “Three fold law”?
 
It’s peculiar to the Wicca doctrine, and other than being a metaphysical and physical principle, it’s an ethical concept which informs that an act’s results returns to that person in a three-folded way.

Although it seems alike to “karma”, it’s a quite different concept. Karma accepts that every act has an inescapable result, but three fold law is the return of that result in a three-time powerful way. This is the point where it separates from karma. Furthermore, karma lasts in the individual’s all incarnations, but three fold law is a rule that should be considered only in the life we are living at the moment.

Karma is a universal and evolutionary doctrine which revolves along all of a person’s incarnations - of course if the person in question believes in that-, three fold law concerns only the current life time - of course if the person in question believes in that-. (The elder laws, by their nature, are supposed to function irrespective of a person’s beliefs; nevertheless I shall follow the eclectic approach:-)