Concerning one's knowledge of Being, Lonergan differentiates three perspectives: the Notion, the Concept and the Idea of Being. The term “notion” is also known as “heuristic notion”, meaning one's attempt to fully apprehend the content of an object not yet completely known. In the context of Being, the term “Notion of Being” conveys the meaning of one's pure desire to know anticipating a Total Horizon which includes everything about everything. From this Supreme Heuristic Notion, Lonergan further emphasizes its objective, subjective, total, central, as well as its puzzling aspect, so as to enable us to have a deeper appreciation of the whole topic.