 While moral realists do not claim that any actual society has or has ever had morality as its actual guide to conduct, “natural law” theories of morality claim that any rational person in any society, even one that has a defective morality, is capable of knowing what general kinds of actions morality prohibits, requires, discourages, encourages, and allows. In the theological version of natural law theories, such as that put forward by Aquinas, this is because God implanted this knowledge in the reason of all persons. In the secular version of natural law theories, such as that put forward by Hobbes (1660), natural reason is sufficient to allow all rational persons to know what morality prohibits, requires, etc. Natural law theorists also claim that morality applies to all rational persons, not only those now living, but also those who lived in the past.