Again when the _De universi iuris uno principio et fine uno_ appeared, or rather the "Synopsis" which announced its programme, "the first voices" which Vico heard raised against him "were tinged with an assumed piety." He found protection and consolation in the face of such criticism in religion itself, that is to say in the approval of Giacchi, "the leading light of the strictest and most holy order of religious."[5] But just as we possess no detailed information as to the criticisms levelled against him on this head, so we have no certain knowledge even of the most general kind as to the religious doubts that may have troubled him. All Vico's writings show the Catholic religion established in his heart, grave, solid and immovable as a pillar of adamant; so solid and so strong that it remained absolutely untouched by the criticism of mythology inaugurated by himself. Nor was Vico an irreproachable Catholic in external demonstration only. He not only submitted every word he ever printed to the double censorship, public and private, of ecclesiastical friends, and led his life as a philosopher and writer among priestly vestments and monastic cowls no less than among legal gowns; he was even scrupulous enough to desist from his commentary on Grotius, thinking it unseemly that a Catholic should annotate a Protestant writer;[6] and so delicate was his sense of Catholic honour that he refused to admit polemic upon matters of religious feeling. "As to this difficulty," he says to his critics of the _Giornale dei letterati_, "like that which you propound to me concerning the immortality of the soul, where it appears that you have in hand seven distinct arguments, if they had not been prepared for me by you, I should judge that they go deeper and penetrate to a region which is not only protected and secured by my life and conduct, but which to defend is to outrage. But let us return to our subject."[7] His Catholicism was untainted by the superstition so general and so deeply rooted at the time, especially at Naples, where St. Januarius intervened as an actor and director in every event of public and private life. It was the Catholicism of a lofty soul and mind, not the faith of a charcoal-burner. But Vico never assumed the part of censor of superstitions. He was content with not speaking of them, as one keeps silence concerning the failings of persons or institutions which command one's respect.