The book known by the name “Refutation of Christian Principles” (we don’t know the original name of this work). This book was originally written in Catalan around 1397–1398, and is available only in the medieval Hebrew translation of Rabbi Josef Ibn Shem  Tov[8] and in modern English and Spanish translations of the Hebrew. The target audience of the Catalan work is probably the Jews of Aragon who didn’t read Hebrew, and the Jewish descendants of the conversos of 1391. In his book, Crescas critiques ten principles of the Christian faith: 1. Original sin. 2. The liberation from this sin. 3. The Trinity. 4. Incarnation. 5. The virginity of Maria. 6. Transubstantiation. 7. Baptism. 8. The coming of the Messiah. 9. The new laws. 10. Demons.