 In the introduction (composed of eleven ‘lessons’) he explores the concepts on which philosophical teaching is based, and the objectives which such teaching tries to achieve.In the context, Debono deals with the concept of truth, the main principle of philosophy (the satisfaction of reason), the intellective method, syllogism, syllogistic argumentation, sophistry (two ‘lessons’), the aim of rational thought, logical judgement, and the centrality of concepts to philosophy.In the section dealing with general metaphysics (only four ‘lessons’), Debono discusses the concepts of the structure (or organisation) of being and of truth as the correspondence to reality, causality, the inclinations of humans as contingent beings, and simple and composite being.