The term “kerygma”, used by Ricoeur in discussing hermeneutics, was a Greek New Testament word. The influential 20th century theologians Rudolf Bultmann and Karl Barth — both referred to by Ricoeur — used it for the message of the Gospels, which Bultmann considered as addressed not to theoretical reason but to “the hearer as a self”. This sort of language resonates with the perspectives of Ricoeur’s mentor Gabriel Marcel.
Bultmann applied a kind of Heideggerian hermeneutics to the New Testament, and developed a sort of Christian existentialism. He contrasted kerygma with myth, and argued for a “demythologizing” view. I don’t know his work well, but have issues with his apparent opposition to an emphasis on ethics and to historical research.
I regard “theoretical” reason merely as a valuable tool used or usable by our everyday ethical reason, which I don’t quite regard as a self, but rather as associated with what we care about and how we act on that. There is, however, only a short distance from this to Ricoeur’s idea of a Self as an ethical aim rather than an actuality. I read Plato, Aristotle, Kant, and Hegel among others as identifying Reason in general first and foremost with the much broader and more “human” or spiritual ethical reason, rather than the narrow “theoretical” reason, which I see as closer to technical reason and formal logic. With this emphasis on ethical reason, it seems to me Bultmann’s dichotomy is superseded. In my view, hermeneutics applies not just to a sacred text, but first and foremost to our understanding of life and ourselves. I also take it to include a good deal of questioning.