[...] It is better to live for just a single day as a ruler than to live for forty years as an abject slave.

Babak Khorramdin's letter to his son, rejecting the caliph’s amnesty message, quoted by Al-Tabari, edited by C. E. Bosworth, History of al-Tabari Vol. 33, The: Storm and Stress along the Northern Frontiers of the 'Abbasid Caliphate: The Caliphate of al-Mu'tasim A.D. 833-842/A.H. 218-227