 To corroborate his thesis, Léon de Poncins cited "Great Britain, The Jews and Palestine", a 1936 book by pro-Zionist author, Samuel Landman.During the Second Vatican Council, following the vote on 20 November 1964, at the third session of the provisional scheme dealing with the Church's attitude towards Judaism, Léon de Poncins wrote a pamphlet, "Le Problème juif face au Concile" (["The Jewish Question Facing the Council"]), which was distributed to the bishops before the fourth and final session.The author noted "by the Council Fathers a profound misunderstanding of what constitutes the essence of Judaism."