The doctrines of praxeology are deduced from three universally acceptable axioms: the major axiom of the existence of purposive human action; and the minor postulates, or axioms, of the diversity of human skills and natural resources, and the disutility of labor. Although it is possible to construct an economic theory of a society without these two minor axioms (but not without the major one), they are included in order to limit our theorizing to laws that can apply directly to reality. Anyone who wants to set forth a theory applicable to interchangeable human beings is welcome to do so.
— Murray Rothbard, Power & Market
Praxeology—economics—provides no ultimate ethical judgments: it simply furnishes the indispensable data necessary to make such judgments. It is a formal but universally valid science based on the existence of human action and on logical deductions from that existence.
— Murray Rothbard, Power & Market
Graphing the History of Philosophy
Very interesting. The above is only a small segment. Click the link for the whole graph.