And the other Don Quixote remained here among us, fighting with desperation. And does he not fight out of despair?... But "despair is the master of possibilities," as we learn from Salazar y Torres, and it is despair and despair alone that begets heroic hope, absurd hope, mad hope. "I hope because it is absurd," it ought to have been said, rather than "I believe because it is absurd".

The Tragic Sense of Life (1913) - Conclusion : Don Quixote in the Contemporary European Tragi-Comedy