Abstract
This book contains the fruits of decades of reflection and teaching on basic philosophical problems, historical, epistemological, metaphysical, and ethical. It does not purport to be a systematic, tightly demonstrative treatise, but a meditation in which opinion and critical irony sometimes have the upper hand. Though the author strongly leans towards Cartesian, Kantian, Hegelian or phenomenological viewpoints, it seems when the cards are down, that the fundamental inspiration of his philosophical thinking remains on the whole Aristotelian and Thomistic.