Following L. Amabile, K. put attention at the similarity of ideas of ‘The City of the Sun’ and some information of the accusatory materials against Campanella; the author characterizes Campanella not only as a writer, but also as a devotee of certain religious and political reforms.

As an introduction to the work, K. uses the trial’s acts of 1599 – on the position of Campanella against the power of Spaniards. He studies the Campanella’s works for the idea of supporting the Papal See, particularly the treatise ‘Volumen quadripartitum’, of four chapters addressed to Christians, Jews, Moslems, and Pagans; it was written after the contacts with Pope Paul V. The author analyzes a message by Campanells to the Great Prince of Moscow, included into the first chapter of the treatise. There was a reproach to the Great Prince for his support of the Schism and refusal from the Oecumenic councils, etc. But at the same time, Campanella called for gathering of a religious world congress – it was the main topic of his text.

The author speaks about two parts of the treatise: a ‘traditional and theoretic’ one, and a specific ‘campanellese’ one. In the first one, there were standard theological ideas; in the second one, Campanella argues for his own position for the sake of the obligatory education on the base of classical philosophy – first of all, on the natural philosophy of classical philosophers.