Hegel was right the author demonstrates that the tradition of the grand philosophy (Plato, Aristotle, Descartes, Hume, Kant and Hegel) made the gift of some key theses of crucial importance for the humanity. These theses widely resist the positivism and skepticism attack. The demonstrative key consists in making realize that the key concepts have not empirical meaning, so self consciousness is the only possible origin of concepts. By the way this explains how human beings from different cultures are capable to understand each other. The demonstrative route of all fundamental concepts (including those of the so called «empirical sciences»), are in the «Science of Logic» of Hegel, and in his «History of Philosophy». This book makes the balance.