In Paris, Jean François attended courses at the College de France and the Ecole des langues orientales, where he studied Hebrew, Arabic, Persian, Syriac, Chaldean, and Coptic. He loved languages, and threw himself into their study with incredible joy. As he wrote his brother in December 1807, his course of study was intensive: At nine oclock [Mondays] I follow M. de Sacys Persian class until 10:00. Leaving the Persian class, since Hebrew, Syriac, and Chaldean are at 12:00, I go to M. Audrans, who offered to take me Mondays, Wednesday, and Fridays from 10:00 to 12:00. ... We spend these two hours talking oriental languages, translating Hebrew, Syrian, Chaldean, or Arabic. And we always dedicate a half-hour to work on Chaldean and Syriac grammar. At noon, we go down, and he gives his Hebrew class. He calls me the patriarch of the class, because I am the best ... .