After Virtue (Chapter 5: “Enlightenment Project of Justifying Morality”):
Abstract changes in moral concepts are always embodied in real, particular events. There is a history yet to be written in which the Medici princes, Henry VIII and Thomas Cromwell, Frederick the Great and Napoleon, Walpole and Wilberforce, Jefferson and Robespierre are understood as expressing in their actions, often partially and in a variety of different ways, the very same conceptual changes which at the level of philosophical theory are articulated by Machiavelli and Hobbes, by Diderot and Condorcet, by Hume and Adam Smith and Kant. There ought not to be two histories, one of political and moral action and one of political and moral theorizing, because there were not two pasts, one populated only by actions, the other only by theories. Every action is the bearer and expression of more or less theory-laden beliefs and concepts; every piece of theorizing and every expression of belief is a political and moral action.
Thus the transition into modernity was a transition both in theory and in practice and a single transition at that. It is because the habits of mind engendered by our modern academic curriculum separate out the history of political and social change (studied under one set of rubrics in history departments by one set of scholars) from the history of philosophy (studied under quite a different set of rubrics in philosophy departments by quite another set of scholars) that ideas are endowed with a falsely independent life of their own on the one hand and political and social action is presented as peculiarly mindless on the other. This academic dualism is of course itself the expression of an idea at home almost everywhere in the modern world; so much so indeed, that Marxism, the most influential adversary theory of modern culture, presents what is just one more version of this same dualism in the distinction between basis and ideological superstructure.This chimes with my own view of the artificial division between history and philosophy—I think there exists a distinct parallel between intellectual and social history.