The material subject of the paper is the philosophy of sustainable development, which was presented on the basis of the Brundtland Report. Yet, the formal subject are the Enlightenment assumptions of the strategy elaborated in this report. The purpose of the paper is to reconstruct and characterize these assumptions as constitutive elements of the philosophy of the Brundtland Report. At the beginning of the first part of the paper the state and main directions of the research on the philosophy of sustainable development conducted in Poland were discussed (the country where such discussion is exceptionally extensive). Based on the recounted characteristics, it was described as a version of the Enlightenment philosophy, and new arguments were...