Since most European nations have been built on the basis of their own languages, it can be said that the European Union is solely based on its linguistic diversity. A sense of common belonging based on linguistic and cultural diversity is undoubtedly a powerful antidote against the manifestations of fanaticism. It is not easy to define exactly or comprehensively the values that everyone should adopt in order to become a full member of the European family. The article aims to prove that the European idea is based on the inextricably linked requirements: universal moral values and cultural diversity. Multilingualism in particular is a unique and significant element to European integration.