Wilfrid Sellars (1912-89) was one of the greatest American philosophers of the 20th century. A pragmatist trained in the analytic tradition, he rethought analytic philosophy from a broadly Kantian point of view, and famously criticized the “Myth of the Given”. His positive reference to Hegel as “that great foe of immediacy” made a great impression on the young Robert Brandom.
Sellars originated the phrase “space of reasons”, now much used by Brandom and others. He said that to hold a commitment at all is to invite questions about the reasons for it. The particular reasons for a commitment involve other reasons, which involve still others, and so on, forming a “space” that can be explored through dialogue.
I would note that in Aristotelian terms, the space of reasons would be a kind of field of potentialities. Because the space of reasons is potential rather than actual, it involves a vast multiplication of alternate (counterfactual) paths, structures, and fibrations. I associate it with an open field of potential Socratic questioning and negotiation. By contrast, both individualized ethos and the beliefs generally shared by an existing community would be kinds of actuality, in which particular alternatives are already selected, but may change over time. (See also Normativity; Intentionality.)