Although the question of human knowing and of being occupies a primary place in the history of human thought, it remains a controversial problem in philosophy. Any meanings that a thinker may assign to the three basic philosophic issues of knowing, objectivity and reality will eventually demarcate his school of thought, and fundamentally determine of cognitional theory, epistemology and metaphysics. Bernard Lonergan stands out as an innovative thinker who has handled this contentious problem in an expressive and methodical manner. His philosophy of Self-Appropriation is a philosophic program that underpins the basic issues and disciplines in a way that is significant for all human inquiries. This work explores the original meanings and interrelations of the three basic philosophic disciplines of cognitional theory, epistemology and metaphysics. After a critical analysis of how the basic issues in philosophy have been handled in the course of history, it offers what are considered as the original meanings and methodical relations of these basic disciplines and issues. Cognitional theory the methodical basics of both epistemology and metaphysics. Since the human desire to know being is the parent of all human inquires, the consideration of the human conscious subject and his cognitional subject and his cognitional operations is prior to and is the ground of the metaphysical explorations. Epistemology is the critical phase that verifies and validates cognitional theory; and methaphysics is an enter-prise that deals with the character of the real.