http://mises.org/daily/4125
[1] A good definition of natural law is put forward by Edwin Patterson, who defines it as
Principles of human conduct that are discoverable by "reason" from the basic inclinations of human nature, and that are absolute, immutable and of universal validity for all times and places. This is the basic conception of scholastic natural law … and most natural law philosophers. (Patterson, E.W. (1953) Jurisprudence: Men and Ideas of the Law. Foundation Press: Brooklyn, p. 333.)
