Moral and Positive
Though men can dispense with their own laws, this is not so with God and the moral law. Human laws are positive, binding only on the part of the legislator, not on the part of the thing. On the contrary, the moral law is of natural right, binding in itself and on the part of the thing.
Francis Turretin, Institutes of Elenctic Theology, ed. James T. Dennison Jr., trans. George Musgrave Giger, vol. 2 (Phillipsburg, NJ: P&R Publishing, 1992-1997), 18.