Robert de Sorbon, his chaplain. "It is a bad thing," he said one day to Joinville, "to take another man's goods, because _rendre_ (to restore) is so difficult, that even to pronounce the word makes the tongue sore by reason of the r's in it." [Footnote 52: By a subtle irony, part of the money was derived from the tribute of the Jews of Paris.] [Illustration: LA SAINTE CHAPELLE.] At another time they were talking of the duties of a layman towards Jews and Infidels. "Let me tell you a story," said St. Louis. "The monks of Cluny once arranged a great conference between some learned clerks and Jews. When the conference opened, an old knight who for love of Christ was given bread and shelter at the monastery, approached the abbot and begged leave to say the first word. The abbot, after some protest against the irregularity, was persuaded to grant permission, and the knight, leaning on his stick, requested that the greatest scholar and rabbi among the Jews might be brought before him. 'Master,' said the knight, 'do you believe that the Blessed Virgin Mary gave birth to Jesus and held Him at her breast, and that she is the Virgin Mother of God?' The Jew answered that he believed it not at all. 'Then,' said the knight, 'fool that thou art to have entered God's house and His church, and thou shalt rue it,' Thereupon he lifted his stick, smote the rabbi under the ear and felled him to the ground. The terrified Jews fled, carrying their master with them, and so," said St. Louis, "ended the conference. And I tell you, let none but a great clerk dispute; the business of a layman when he hears the Christian religion defamed is to defend it with his sharp sword and thrust his weapon into the miscreant's body as far as it will go."