 Reggio's most important works are "Ha-Torah weha-Pilusufiah," "Mafteaḥ el Megillat Ester," and "Beḥinat ha-Ḳabbalah".The first, a religious-philosophical essay in four sections ("ma'amarim"), was written as an answer to the rabbis of the old school who protested against the establishment of the rabbinical college at Padua.It should be explained that Reggio applies the term "philosophy" to all studies outside the Talmud and rabbinics.