Christianity is the Fulfillment of All Laws

Spengler makes a powerful point here (go to page 2):

That is why I keep returning to Franz Rosenzweig's remarkable insight that humans are sentient of the death of their cultures as much as they are of their own physical death:

Just as every individual must reckon with his eventual death, the peoples of the world foresee their eventual extinction, be it however distant in time. Indeed, the love of the peoples for their own nationhood is sweet and pregnant with the presentiment of death. Love is only surpassing sweet when it is directed toward a mortal object, and the secret of this ultimate sweetness only is defined by the bitterness of death. Thus the peoples of the world foresee a time when their land with its rivers and mountains still lies under heaven as it does today, but other people dwell there; when their language is entombed in books, and their laws and customs have lost their living power.

A sick cat or dog will crawl into a hole to die. The members of sick cultures do not do anything quite so dramatic, but they cease to have children, dull their senses with alcohol and drugs, become despondent, and too frequently do away with themselves. This is not due to an inborn death-drive, contrary to the odious Freud, but rather a symptom of a culture's mortal illness.

That is why pagans become Christians. That is, individuals embrace Christianity when their pre-Christian culture no longer can transmit their memory as well as their genes to future generations. Christianity, in that sense, succeeds precisely where "natural law" fails. Self-confident and secure pagans do not seek life eternal through belief in Jesus Christ, for they are quite happy to believe in themselves. It is when they have reason to cease to believe in themselves, when the depredations of the empires, or the great tide of globalization, overrun their defenses and expose their mortal fragility.

It's a little hard to tell here where Rosenzweig ends and Spengler begins (I'm guessing on my punctuation). Speaking of which, Rosenzweig seems a thinker well worth reading -- here is Spengler's survey of the various editions.