The article is a reflection on the issues of natural law. The dominant view in the literature on the subject is that natural law is a kind of matrix that should be duplicated by the legislator in order to prevent legal injustice. According to the Latin paremia: Lex iniusta non est lex (Unjust law is not law), the legislator must take into account unspecified higher- level norms. The aim of the article is to look from a philosophical perspective at the axiological foundations of the Polish legal order in the context, primarily, of the sources of law. According to the author of the article, in modern times the rationalism of natural law is becoming apparent, and its religious foundations will not necessarily be acceptable in a culturally pluralized society. The legal analysis method was used, the historical-legal method (in terms of examining the evolution of legal ideas underlying individual constitutional regulations) and the hermeneutic method in relation to the examination of the Constitution as a product of culture, not so much in the linguistic, but in the social, cultural and historical layer. The analysis of applicable legal provisions also forced the use of the formal and dogmatic method.