While still a young man he was compelled to debate in public, on original sin and redemption, with Cardinal Pedro de Luna, afterward Antipope Benedict XIII. This disputation took place in Pamplona, December 26, 1375, in the presence of bishops and learned theologians (see his "Eben Boḥan"; an extract, entitled "Wikkuaḥ" in manuscript, is in the Bibliothèque Nationale, Paris, No. 831).
