▁rather ▁than ▁natural ▁law , ▁but ▁R . ▁A . ▁G once ▁arg ues ▁that ▁" the ▁reality ▁of ▁the ▁argument ▁const itut ing ▁his ▁system ▁over wh el ms ▁his ▁den ial ." ▁Murray ▁Roth b ard , ▁however , ▁says ▁that ▁G once ▁makes ▁a ▁lot ▁of ▁errors ▁and ▁dist ort ions ▁in ▁the ▁analysis ▁of ▁M ises ' s ▁works , ▁including ▁making ▁conf us ions ▁about ▁the ▁term ▁which ▁M ises ▁uses ▁to ▁refer ▁to ▁scientific ▁laws , ▁" la ws ▁of ▁nature ", ▁saying ▁it ▁character izes ▁M ises ▁as ▁a ▁natural ▁law ▁phil os opher . ▁David ▁Gordon ▁notes , ▁" When ▁most ▁people ▁speak ▁of ▁natural ▁law , ▁what ▁they ▁have ▁in ▁mind ▁is ▁the ▁cont ention ▁that ▁mor ality ▁can ▁be ▁derived ▁from ▁human ▁nature . ▁If ▁human ▁be ings ▁are ▁rational ▁animals ▁of ▁such - and - such ▁a ▁sort , ▁then ▁the ▁moral ▁virt ues ▁are ... ( fill ing ▁in ▁the ▁bl anks ▁is ▁the ▁difficult ▁part ). " ▁ ▁Econom ist ▁and ▁phil os opher ▁F . ▁A . ▁Hay ek ▁said ▁that , ▁originally , ▁" the ▁term ▁' natural ' ▁was ▁used ▁to ▁describe ▁an ▁order lin ess ▁or ▁regular ity ▁that ▁was ▁not ▁the ▁product ▁of ▁deliber ate ▁human ▁will . ▁T ogether ▁with ▁' organ ism ' ▁it ▁was ▁one ▁of ▁the ▁two ▁terms ▁generally ▁understood ▁to ▁refer ▁to ▁the ▁sp ont ane ously ▁grown ▁in ▁contrast ▁to ▁the ▁invent ed ▁or ▁designed . ▁Its ▁use ▁in