I mean all changes whether of state or action, that do not consist in the states or actions of free will. Physical law is the law of the material universe. It is also the law of mind, so far as its states and changes are involuntary. All mental states or actions, which are not free and sovereign actions of will, must occur under, and be subject to, physical law. They cannot possibly be accounted for, except as they are ascribed to the law of necessity or force.
Moral law is a rule of moral action with sanctions.
It is that rule to which moral agents ought to conform all their voluntary actions, and is enforced by sanctions equal to the value of the precept. It is the rule for the government of free and intelligent action, as opposed to necessary and unintelligent action. It is the law of liberty, as opposed to the law of necessity of motive and free choice, as opposed to force of every kind. Moral law is primarily a rule for the direction of the action of free will, and strictly of free will only. But secondarily, and less strictly, it is the rule for the regulation of all those actions and states of mind and body, that follow the free actions of will by a law of necessity.