In short, for an action to be “moral,” it must not be reducible to an act or a series of acts conforming to a rule, a law, or a value. Of course all moral action involves a relationship with the reality in which it is carried out, and a relationship with the self. The latter is not simply “self-awareness” but self-formation as an “ethical subject,” a process in which the individual delimits that part of himself that will form the object of his moral practice, defines his position relative to the precept he will follow, and decides on a certain mode of being that will serve as his moral goal. And this requires him to act upon himself, to monitor, test, improve, and transform himself. There is no specific moral action that does not refer to a unified moral conduct; no moral conduct that does not call for the forming of oneself as an ethical subject; and no forming of the ethical subject without “modes of subjectivation” and an “ascetics” or “practices of the self” that support them. Moral action is indissociable from these forms of self-activity, and they do not differ any less from one morality to another than do the systems of values, rules, and interdictions.
Michel Foucault, The History of Sexuality, Vol. 2 (via belacqui-pro-quo)