For both Siedentop and Berman, 1075 is a truly revolutionary, world-historical turning point, for that is when Pope Gregory insists on the independence of the church from secular authorities. As a consequence, the king, at least in theory, is demoted to a mere layperson instead of combining spiritual and temporal power in his person. Indeed, he can't do that, because only Jesus does.
As always, timelessness takes time: "Gregory's vision of a social order founded on individual morality" instead of "brute force and mere deference, had taken centuries to prepare" (Siedentop). You know, like the way a person goes bankrupt: very gradually and then all of a sudden.
So, suddenly "relations of equality and reciprocity are now understood as antecedent to both positive and customary law." Thus, law is disentangled from custom, and seen more abstractly as a universal category. This constitutes a "reversal of assumptions," such that "instead of traditional social inequalities being deemed natural... an underlying moral equality was now deemed natural."
This Great Disentangling "freed the human mind, giving a far wider scope and a more critical edge to the role of analysis. It made possible what might be called the 'take off' of the Western mind" (emphasis mine), vaulting mother Europe "along a road which no human society had previously followed." Vertical liftoff!
Here we can see how the left's retarded project involves a Great Re-entangling: again, it took thousands of years for "individuals rather than established social categories or classes" to become "the focus of legal jurisdiction." But now, thanks to the left, the individual is subsumed into race, class, gender, sexual orientation, etc., and we're back to where we started: post-Christian necessarily redounds to the pre-Christian.
"The papal claim of sovereignty" furthered the transition to the "meta-role" of the individual "shared equally by all persons." Seen this way, the self is the essence, while social roles become mere accidents instead of being in the nature of things.
It seems to me that this idea of disentanglement is key; it reminds me of how the fertilized egg first divides into two, then four, eight, sixteen, etc., becoming more complex and specialized along the way. There is still unity, of course, but it is a deeper form of organic unity because the diversity is unified on a higher level.
Just so, once the secular-spiritual cell divides in two, this initiates further divisions and distinctions. For example, philosophy becomes distinct from theology, and more generally, "logical studies" develop "with astonishing rapidity during the twelfth century."
Likewise, a new distinction is seen between the moral and physical elements of crime. Because of the new interiority, the concept of "intent" or motive comes into play: "intentions had scarcely been distinguished from actions in 'barbarian' justice." "Degrees of guilt" are perceived, and punishment becomes distinct from mere retaliation.
Marriage changes too, as measures are adopted to ensure that it is "based on consent rather than coercion." Politics too: instead of authority flowing in one direction only, from the top down, "The authority of superiors thus became a delegated authority. Authority is again understood as flowing upwards."
If we stand back and look at the overall arc, we see that "under way was nothing less than a reconstruction of the self, along lines more consistent with Christian moral intuitions." This ushers in "a new transparency in social relations," for now we relate to another person, not just his role. Conversely, "in societies resting on the assumption of natural inequality," this interpersonal transparency is obscured.
Another major development is the distinction between free will and fate, choice and necessity. If human beings are personally accountable to God, then this emphasizes not only our moral freedom, but the need for political freedom so that we are free to exercise moral choice. In other words, nothing less than eternity is at stake, so the freedom to do good becomes a matter of urgent necessity; for what is free will but "a certain ability by which man is able to discern between good and evil"?
Note that if people are fundamentally unequal, then we can make no generalizations about them: there is one law for the sheep, another for the wolf; or one law for us, another law for Obama.
With this new self, there is a kind of interiorizing of the logos: instead of the logos being only a sort of exterior reason that controls events, it is "understood as an attribute of individuals who are equally moral agents." Here again, in the post-Christian world we see a regression to determinism, for example, the idea that we are controlled by genes, or neurology, or poverty, or race.
The empirical becomes distinct from the general, induction from deduction: "The Christian preoccupation with 'innerness' and human agency," or "between the will and the senses," leads to "a growing distrust of the coercive potential of general terms or concepts, if an extra-mental reality is attributed to them."
Conversely, leftism is always rooted in the projection of an abstraction onto the world, thus giving it the illusion of an "extra-mental reality" or self-evident fact. Scientism, materialism, metaphysical Darwinism -- each elevates an uncritical naïveté to the highest wisdom.
Come to think of it, this is one of the major themes of The Great Debate: conservatives begin with the world as it is, whereas the left begins with the world as they wish it were. We'll be hearing a lot about this tonight, but it all comes down to an atavistic desire on the part of the left to undo the work of centuries and re-entangle mind and world, individual and group, state and citizen, time and eternity, freedom and compulsion, messiah and politician, executive and legislature, class and guilt, etc.