Abstract: This article attempts to analyze the common and peculiar within the content of the European constitutions of the XVIII-XIX centuries from the perspective of the philosophical-legal ideas of Antiquity. Special attention is given to the impact of Plato’s and Aristotle’s doctrines upon the spirit of the two constitutional acts of France, Germany and Poland. In the author’s opinion, the concepts of the Ancient Greek thinkers did not fade their importance for the legal science, which is defined by the demand of modern society for the establishment of positive sustainable values during the era of global transformations. The author substantiates a thesis that for finding an optimal balance of values within the modern theory of constitutional law, become relevant the methods proposed by the thinkers of Ancient Greece. Implementation of Aristotle’s principle of the golden mean from the perspective of legal science suggests that the key goal of constitutional regulation is the ensuring of compromise of all social strata through achieving the mathematical equilibrium of the axiological system. However, the realization of the concept of axiological formation of the future with the help of constitutional acts allows affecting the social relations, which cannot develop in any other way rather that the correlating influence by the norms of basic law.