In reality, neither Jewish nor Christian traditions know anything of the ideas of natural rights and social contract found in Hobbes, Gassendi and Locke. That's because those ideas were inspired by themes found in non-Christian Greek and Roman philosophy. Ideas of the social contract were anticipated in the fourth and fifth centuries BC by the sophists Glaucon and Lycophron, according to Plato and Aristotle, and by Epicurus, who banished divine activity from a universe explained by natural forces and taught that justice is an agreement among people neither to harm nor be harmed. The idea that all human beings are equal by nature also comes from the Greek sophists and was planted by the Roman jurist Ulpian in Roman law: "quod ad ius natural attinet, omnes hominess aequales sunt" — according to the law of nature, all human beings are equal. ¶ Desperate to obscure the actual intellectual roots of the Declaration of Independence in Greek philosophy and Roman law, Christian apologists have sought to identify the "Creator" who endows everyone with unalienable rights with the revealed, personal God of Moses and Jesus. But a few sentences earlier, the Declaration refers to "the Laws of Nature and of Nature's God." Adherents of natural rights liberalism often have dropped "Nature's God" and relied solely on "Nature" as the source of natural rights.