From an approach of a history of ideas, this paper will present textual work around the notions of revelation and intuition, as modes of acquiring knowledge/truth reputed to be "irrational". It proposes to study the way in which these notions are signified in medieval and modern scholarly and religious texts, from a comparative perspective in the Muslim and Christian worlds. This paper is based on the observation of how these notions are formulated, interpreted and explained in the texts of Ibn Sina (Avicenna) (980 - 1037), Al Ghazali (1058 - 1111), Thomas Aquinas (1224 - 1274) and Calvin (1509 - 1564). In particular will be presented, the notion of ishrāq, illumination and the notion of intellective intuition developed by the philosopher Ibn Sina. The notion of dhawq, "spiritual taste", as opposed to kalâm and the transmission of knowledge by word and teaching in Al Ghâzali. Thomas Aquinas's notion of faith and revelation as modes of truth and knowledge that are distinct from, but not incompatible with, reason, and Calvin's distinction between intuitive and abstract knowledge. These interpretations will be discussed alongside the notion of revelation and prophecy as modes of knowledge and transmission of truth in the New Testament and the Koran. The aim of this study is to understand the different meanings and interpretations of these notions by these authors, to observe cultural transfers and the way they are mobilized in medieval, modern and contemporary times. Is there a hermeneutical continuum between the different interpretations, or are the explanations circumstantial and subject to the context of enunciation and the author's cosmovision, i.e., representation of the world (Berger, 1967)? This study enables us to grasp the meanings, convergences and distinctions established between these authors, and to appreciate the hermeneutical continuities and ruptures, as well as the contemporary prints of the different knowledges built up around this notion.