Analyzing the legal dimension of tolerance in the field of international law (especially in international U.N. Declarations and Covenants on human rights), the author emphasizes how the principle of tolerance implies not merely a legal system “agnostic” to religious truth but also the development of minorities and the principle of non-discrimination in a democratic system. Non-discrimination appears to be particularly important in the face of the current phenomena of religious extremism and intolerance; development of a multicultural society is recognized in the U.N. Declaration against Intolerance and Discrimination of 1981.