In 1726 Ansaldi entered the Dominican Order at Parma, where he pursued his preparatory studies. In 1733 he was a student of the College of St. Thomas in Rome, the futurePontifical University of Saint Thomas Aquinas, Angelicum where he attached himself to Giuseppe Agostino Cardinal Orsi. In 1735 he taught philosophy at Santa Caterina in Naples, and the following year received the chair of metaphysics at the University of Naples. However, in 1737 he was forced to resign after receiving orders from his superiors to move to Bologna. He seems to have disobeyed the order and gone into hiding for some time to avoid the consequences. The King of Naples created a chair of theology for him in 1737, which he retained until 1745. In that year he was appointed first teacher of theology at the Dominican convent in Brescia. Thereafter, to 1770, he taught at Ferrara and then at Turin. In the latter city he held the chair in theology for twenty years with great success and repute. He was averse to the scholastic method and therefore had serious trouble with the authorities of the Order, which was finally smoothed over by Angelo Maria Cardinal Quirini and Pope Benedict XIV.
Work
His published works fill several volumes, and have been prized for a combination of theological and historical erudition. Most of them are directed against the anti-Christian tendencies of his day. His most important works are:
De Causis Inopiae veterum Monumentorum pro copia Martyrum Dignoscendi
De Martyribus sine Sanguine Disseratio
Patriarchae Josephi, Aegypti olim proregis, religio a criminationibus Basnagii vindicata, vol. XIII in the Raccolta d'opuscoli di P. Calogerà
"Dissertatio de veteri Ægyptiorium Idolatriâ", in the Raccolta Calogerana, 23, 135.
De Principiorum Legis naturalis Traditione, Libri tres
De Romanâ tutelarium deorum in oppugnationibus urbium evocatione liber singularis
De traditione principiorum legis naturalis
De martyribus sine sanguine, a valuable anti-Dodwellian dissertation on the sufferings of the primitive Christians
De Forensi Judaeorum Buccina Commentarius
Herodiani infanticidii vindiciae against those who impugned its historicity
De authenticis sacrarum Scripturarum lectionibus, a learned and solid work in favor of the accuracy of the Fathers in quoting Scripture
De baptismate in Spiritu Sancto et igni commentarius sacer philologicocriticus
De Theurgiâ deque theurgicis a divo Paulo memoratis commentarius
Riflessioni sopra i mezzi di perfezionare la filosfia morale, with a biography of the author
His controversy with Francesco Zanotti in defense of Maupertuis's apology for Christian morality, as superior to that of the Stoics, was celebrated in the eighteenth century. He also compiled Della necessità e verità della religione naturale e rivelata, a collection of evidences and admissions from the works of celebrated non-Catholics. His brother, also a Dominican, Carlo Agostino Ansaldi, wrote a work on the large number of the Christians before Constantine I; another brother, Pietro Tommasso Ansaldi, wrote a dissertation on the divinity of Christ.
