"Neglect of the problem of the human individual leads to impoverishing Marxism at the theoretical level and to distorting it at the practical level. In this mistake lies the deep secret of Stalinism. This is why the protagonists of “true” Marxism — where the individual is absent—are so dangerous. I am referring not only to those who put Stalinism into practice, but also to its theorists, whose various political lucubrations and theoretical mistakes have resulted in the thesis that Marxism is anti-humanism. If this were the case, we would have to fight it. But it is a pure lie: Marxism is humanism, and it is the concern of Marxists to fight in the name of such humanism. This has always been my firm belief, as a Marxist and as a Communist. And this fact explains the choice of the lietmotif of my philosophical works."

“Ajdukiewicz's view, published in the Erkenntnis, certainly did not fail to influence the opinions held by the neo-positivist supporters of semantic philosophy. But Ajdukiewicz was not alone in his opinions which fitted Carnap's principle of tolerance and, e.g., the theories of C. G. Hempel.”

“When in accordance with the materialistic analysis of the cognitive process we consider thought and human consciousness as linguistic thought, as thought made of language , it is evident that any analysis of the cognitive process must also be the analysis of the linguistic process, without which thought is simply impossible.”

“Science and ideology are closely connected to each other, in spite of those pedants who would like to separate them. In any case, since social praxis, which produces and promotes the develópment of language, is the common basis for both the relatively objective knowledge of the world, and for attitudes of evaluation, a genetic link exists.”

“For Bréal, semantics was the science the subject matter of which was study of the cause and structure of the processes of changes in meanings of words: expansion and contraction of meanings, transfer of meanings, elevation and degradation of their value, etc.”

“A system of opinions which, being founded on a system of accepted values, determines the attitudes and behavior of men with respect to desired objectives of development of the society, social group or individual.”

“Carnap : a language, as e.g. English, is a system of activities or, rather, of habits, i.e., dispositions to certain activities, serving mainly for the purposes of communication and of co-ordination of activities among the members of a group.”