In the twelfth century, reason began to lose the ontologically privileged position it had been accorded by an… — Larry Siedentop

Only the pride of the intellect could suppose that the human will can be completely self-determining. The incarnation revealed that something more is needed. ‘My mind, questioning itself upon its own powers, feels that it cannot rightly trust its own report.’ Augustine’s conception of the self became a subtle mixture of autonomy and dependence.

Christianity changed the ground of human identity. It was able to do that because of the way it combined Jewish monotheism with an abstract universalism that had roots in later Greek philosophy. By emphasizing the moral equality of humans, quite apart from any social roles they might occupy, Christianity changed ‘the name of the game’. Social rules became secondary. They followed and, in a crucial sense, had to be understood as subordinate to a God-given human identity, something all humans share equally. Thus, humans were to live in ‘two cities’ at the same time.

Paul and Augustine transformed Jewish belief in a divine will directed at a ‘chosen’ people. They universalized the claims of that will and internalized it, making it available to all of humanity. In doing so, they created the potential for ‘Christian liberty’, a rightful power for individuals. By combining the assumption of human equality with the need to discover the divine will, a new relationship with deity became possible, one that was personal rather than tribal. Yet if Paul and Augustine conjured up a vision of moral freedom, it was the twelfth-century canonists who converted that vision into a formal legal system founded on natural rights.