The first substantive portion of the paper will offer an elementary model of natural law reasoning as a point of departure for thinking about law and justice. Although the term "natural law" has many implications, in this paper it stands for the modest common sense proposition that some rights and duties can be discerned, by operation of our reason, from our common humanity and our human relationships. Natural law reasoning has been extended far beyond this basic proposition - but not in this paper, which concedes that disagreement is reasonable and inevitable in the application of this proposition.