The concept of original sin gives us a penetrating insight into human destiny. - Leszek Kołakowski

As for one-party rule, it was questioned neither by the Left Opposition nor by the Right [wing of the Communist party]. All were prisoners of their own doctrine and their own past: all had worked with a will to create the apparatus of violence that crushed them. Bukharin’s hopeless attempt to form a league with Kamenev was no more than a pitiful epilogue to his career. In November 1929 the deviationists performed a public act of penance, but even this did not save them. Stalin’s victory was complete; the collapse of the Bukharinite opposition meant the triumph of autocracy in the party and in the country. In December 1929 Stalin’s fiftieth birthday was celebrated as a major historical event, and from this point we may date the “cult of personality”. Trotsky’s prophecy of 1903 had come true: party rule had become Central Committee rule, and this in turn had becorne the personal tyranny of a dictator. (pp. 42-3)

… Marx and Bakunin were engaged in a conflict in which it is hard to distinguish political from personal animosities. Marx did his best to persuade everybody that Bakunin was only using the International for his private ends, and in March 1870 he circulated a confidential letter to this effect. He also saw the hand of Bakunin (whom he never met after 1864) on every occasion when his own policies were opposed in the International. Bakunin, for his part, not only combated Marx’s political programme but, as he often wrote, regarded Marx as a disloyal, revengeful man, obsessed with power and determined to impose his own despotic authority on the whole revolutionary movement. Marx, he said, had all the merits and defects of the Jewish character; he was highly intelligent and deeply read, but an inveterate doctrinaire and fantastically vain, an intriguer and morbidly envious of all who, like Lassalle, had cut a more important figure than himself in public life. (pp. 247-8)

Carnap made a detailed analysis of Heidegger’<nowiki/>s statement, “Nothing nihilates,” in order to show that it is purely verbal, devoid of empirical meaning. (Incidentally, this is the only sentence from existentialist philosophy the majority of contemporary positivists appear familiar with.)