Value pluralism, a philosophical perspective belonging to the humanist and liberal family, is meeting with increasing attention and support in contemporary political and moral philosophy. Its starting point is that (personal and social) human life is characterized by conflict between the various (good) values and ends that are pursued. Value pluralism takes cultural and moral diversity seriously and thereby also denies the validity of - in their view - potentially dangerous monisms that promise a perfect, tension-free human life. But does value pluralism itself not lead to another danger -that of moral relativism and questioning the meaning of human life itself? This study describes the anthropology of Sir Isaiah Berlin (1909-1997), value pluralism's founding father. Berlin wants to protect both moral and cultural diversity against monist tendencies but at the same time struggles to avoid moral relativism.