In the article the Kant theory of ability of judgment is interpreted. In particular, the article concerns the concepts of multiculturalism and cultural tolerance, the ideas that has not found their realization so far at this historical stage. Hannah Arendt's reflections are the basis for our interpretation. In her works she shows that Kant's fundamental statement can be applied more broadly, and thus the ability of judgment can be also applied to political thinking. Comparison of Kant's and Arendt's approaches allows to specify understanding of ability of judgment: the latter should definitely comprise the concept of belief. The concept of belief bears ambivalence, and “a blind spot” of thinking is a part of this phenomenon. This concept arises as a result of the analysis of functions of theoretical reason, practical reason and ability of judgment. The author argues that violation of borders between these areas is one of main causes of problems that people face both in everyday life. The carried-out analysis highlights aprioristic mechanisms which overstate the private over the general (transcendental), the mechanisms which form grounds for formation of interpersonal, social and political tension.