"He helps us to comprehend that law itself (as opposed to legislation) is largely spontaneous and undesigned. Not all legislation is law - consider the fact that highway drivers routinely exceed posted speed limits by five or ten miles per hour. And not all law is created by legislation (or even by court proceedings) - consider the "first come, first served" rule..."
Similar to the just because you can do it doesn't mean you should. This applies more to civil rule as opposed to moral choices. It says some thing about the needless overly legal way legislation is written and implemented as well as needless number of laws that are passed. So,
Have Laws Not Legislation