Introduction; Part I. Logical Fables: 1. Abélard's donkey: the nonexistent particular; 2. The literate animal: naming and reference; 3. The fox and the unicorn: naming and existence; Part II. Figures of Contradiction: 4. The opponent; 5. The fool who says no to God; 6. The man who says no to reason; Part III. Fathers, Sons, and Friends: 7. Aristotle or the founding son; 8. Abélard or the fatherless son; 9. The dialectics of friendship; Conclusion; Bibliography.