To require a citizen to sign a loyalty oath is to destroy some of the loyalty he could otherwise claim, since any subsequent loyal behavior may then be attributed to the oath.
B. F. SkinnerThe evolution of cultures appears to follow the pattern of the evolution of species. The many different forms of culture which arise correspond to the "mutations" of genetic theory. Some forms prove to be effective under prevailing circumstances and others not, and the perpetuation of the culture is determined accordingly.
B. F. Skinner