 He devoted three volumes to an exposition of Catholic doctrine and two to the Christian virtues, and published several volumes of sermons.Meanwhile, he maintained personal relations with various persons, particularly priests and religious at Naples, among them the Franciscan Ludovico da Casoria, whose biography he wrote, and two priests Persico and Casanova, with whom he often discussed methods of catechetical instruction.He corresponded with other Liberal Catholics, among them Manzoni, Cesare Cantu, Dupanloup, and Montalembert.