All the Petrashevskyians were condemned to be shot, and the sentence was read to them on January 3, 1850, on the scaffold, where they stood stripped, in the freezing cold, for twenty minutes, in momentary expectation of their execution. But the death sentence was mitigated in different degrees by the Emperor, Dostoevsky's sentence being commuted to exile with hard labor for four years, and then service as a common soldier in the ranks. He was dispatched to Siberia two days later, which was on Christmas Eve, according to the Russian reckoning. The wives of the Decembrists (the men exiled for revolutionary plots in 1825, at the accession to the throne of the Emperor Nicholas I.), visited the Petrashevskyians in prison at Tobolsk and gave Dostoevsky a copy of the Gospels. No other book made its way within the prison walls, and after reading nothing else for the next three years, Dostoevsky, according to his own words, "forced by necessity to read the Bible only, was enabled more clearly and profoundly to grasp the meaning of Christianity." In his "Notes from a Dead House" he has described in detail his life in the prison at Omsk, and all his impressions. Prison life produced an extremely crushing and unfavorable impression on him. He was brought into close contact with the common people, was enabled to study them, but he also became thoroughly imbued with that spirit of mysticism which is peculiar to ignorant and illiterate people. His own view of the universe was that of childlike faith, and prison life strengthened this view by leading him to see in it the foundation of the national spirit and the national life. During the last year of his prison life, under a milder commandant, he was able to renew his relations with former schoolmates and friends in the town, and through them obtain more money, write home, and even come into possession of books. But his health was much affected, his nerves having been weak from childhood, and already so shattered that, in 1846, he was on the verge of insanity. Even at that time he had begun to have attacks by night of that "mystical terror," which he has described in detail in "Humiliated and Insulted," and he also had occasional epileptic fits. In Siberia epilepsy developed to such a point that it was no longer possible to entertain any doubt as to the character of his malady.