The author discusses the commentaries and criticisms presented in the «Brescia’s Seminar» organized on FERRAJOLI’S last work, Principia iuris. FERRAJOLI’S answer is threefold: 1) Questions on meta-theory of law and democracy. The topics here discussed are connected to: the axiomatic method, his conception of legal theory, legal dogmatics, sociology of law and political philosophy, and FERRAJOLI’S understanding of constitutionalism in terms of legal positivism. 2) Questions on legal theory. Here, FERRAJOLI includes problems connected to his conception of legal gaps and legal contradictions, as well as the relationship between law and logic, specifically the topic of implicit norms. 3) Questions on theory of democracy: the foundations of human rights, constitutional democracy, the relationship between constitutional democracy, political power and sovereignty, the constitutive character of the employment contract and the techniques to fulfill legal gaps, separation of powers and garantism, war and international relations, and «methodological optimism».