1 Introduction 2. Reflection on some historical episodes 3. The CP and the PSR objections to the PSR 4. A modern version of the Hume objection 5. The anti-theological argument: 'There are no necessary beings' 6. Modal fatalism 7. Free will 8. Quantum mechanics 9. Turning Leibniz against the PSR 10. What survives the criticisms of the PSR? justification of the PSR 11. Self-evidence 12. Three Thomistic arguments 13. Modal arguments 14. Is the universe reasonable? 15. Explanation of negative states of affairs 16. The puzzle of the everyday applicability of the PSR 17. Inference to the best or only explanation 18. Inductive scepticism 19. The nature of possibility 20. Conclusions.
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