The Laws of Magic are not legislative laws, but, like those of physics or musical harmony, are actually fairly practical observations that have been accumulated over thousands of years. These laws describe the way magic seems to behave:
The LAW OF KNOWLEDGE:
This is probably the most widely used law, and probably encompasses all the others in some way. The basis of this law is that understanding brings control. The more that is known about a subject, the easier it is to exercise control over it. Knowledge is power.
The LAW OF SELF-KNOWLEDGE:
An obvious derivative of the LAW OF KNOWLEDGE, this law carries additional connotations, as a mage who does not have knowledge of himself does not have knowledge (and therefore control) of his own magic. This law is one of the reason's "evil" mages are very rare - a dedication to "evil for evil's sake" is usually due to a lack of introspection and awareness of oneself. It is difficult to do harm to others when you understand fully what that kind of harm would do to you. Know thyself.
The LAW OF CAUSE AND EFFECT:
A simple scientific understanding - if exactly the same actions are done under exactly the same conditions, they will be associated with exactly the same results. Magicians have at least as much belief in cause and effect as modern physicists do, they just realize that a good ritual, like a good theatrical performance or a good bread recipe, isn't always predictable. In truth, a spell involves so many variables, that controlling or even understanding them all is impossible. The key to magical success is learning which variables are the most important, and how to keep them constant. Control over the variables is icing on the cake.
Two or more events happening at the same time are likely to have more in common than the merely temporal. Very few events ever happen in isolation from other events. There is no such thing as a mere coincidence.
The LAW OF WORDS OF POWER:
There exist certain words that are able to alter the internal and external realities of those uttering them, and the power may rest in the very sounds of the words as much as their meanings. Many of such words are names, though the meanings may have been lost or forgotten. Very many magical tools require words to be inscribed upon them and/or said over them during their construction and/or use.
The LAW OF PERSONAL UNIVERSES:
Every sentient being lives in and quite possibly creates a unique universe which can never be 100% identical to that lived in by another. So called "reality" is in fact a matter of consensus opinions. This law is nowhere near as obvious as the other laws in it's applications, but if you can figure some out, you can use it.
The LAW OF SYNTHESIS:
The synthesis of two or more "opposing" patterns of data will produce a new pattern that will be truer than either of the first two were. That is, it will be applicable to more levels of reality, and this new pattern may not be a compromise, but may be something rather new indeed.