He was appointed by Leo XII professor of canon law at the Sapienza, and in 1830 was elected Superior-General of the Theatines.

His eloquence, though somewhat exaggerated and prolix, was vehement and direct, with a noble bearing, a magnificent voice and an affecting delivery, and it won him great renown.

As commissioner from Sicily, he was present at a controversial politico-religious ceremony in St. Peter's Basilica, but took no active part in the services.

He opposed French intervention in behalf of the pope and when Marshal Oudinot attacked Rome, spoke of Pius IX in words which he bitterly regretted.

In 1857 he gave the Lenten Sermons at the Tuileries before Napoleon III; these appeared as "Le pouvoir politique chrétien".

Ventura's philosophical views received final expression in "La tradizione e semi-pelagiani della philosophia", "Saggio sull' origine dell'idee", "Philosophie chrétienne" (Paris, 1861).