Foucault aims to free power from institutions, so that they can be viewed as technologies and, relatedly, so that institutions can be seen as unstable. To this end, Foucault contends that power is not a substance or phenomenon that can be dissected, but a relation between humans, in which one can demand the conduct of another.
For Foucault, the state is only an episode in government, not the other way around. Thus, the state is situated within a longer history of governmental power. In this way, Foucault is set on theorizing the present, as they live in the era of governmentality that began in the 18th century.
In theorizing the present, Foucault contends that Christian pastoral power has been absorbed by state. Foucault's way of demonstrating this long history of pastoral power by juxtaposition it with political power, which is decidedly not pastoral. The pastorate, as a form of governing men, marks the threshold for the modern state, alongside the development of governmentality being a calculated and discursive practice. However, the pastorate is the power most typical power of the west and has made possible an extreme amount of violence. It functions by keeping watching, rather than surveying a territory or jurisdiction. This function of keeping watch demarcates the pastorate capacity to individualize.
Crucially, the pastorate is composed of three spheres: salvation, obedience, and truth. The salvation of the flock and the shepherd are imbricated in one another. There is also the shepherd's paradox: one sheep must be saved at the expense of all others, but all other sheep must be saved at the expense of one. The sheep is also, as a good in itself, entirely subordinated to the pastor. This obedience is actualized through various institutions of Christian history, yet it culminates in the eventual subordination of the sheep's will to the pastorate. Through this, the Church and its pastoral rules lays claim to the daily government of men, which is singular to the Christian tradition throughout world history. In constructing this history, Foucault reads many early Church thinkers (i.e., Cassian, Jerome, Benedict) treatises on the pastorate. Thus, the Christian pastorate is so important to Foucault is so crucial because it governs the conduct of men in a way political thought did not. And it is this governing of men that takes its cue from the pastorate.
Provocatively, Foucault estimates that there has never been an anti-pastoral revolution, by which he means movements and people have never challenged the primacy of conduct, but simply who is fit to conduct oneself.
However, there remains an ambiguity. Is it simply that the pastorate is a precedent for governmentality or is the explosion of governmentality actually derivative of an internal crisis of the pastorate during the Reformation? Foucault hints at both of these narratives, but the precise rule of the pastorate in contemporary politics--outside of governmentality entailing the governing of men--remains unclear. Is the pastorate merely a moment in the history of governmental reason, undoubtedly, for Foucault, the most dominate, or still the structuring motif of the present?