The aim of the paper is to present the economic thoughts of John Calvin and his followers, referring to current issues, such as money lending, usury, or work. The latter, according to the famous thesis of Max Weber, received spiritual value by acting as a bridge between God's will and daily life. The hypothesis of this article differs somewhat from this conviction, assuming that the main economic elements of Calvinist thought have been the consequence of the release of temporal realities from the influence of the direct action of God, according to the protestant theology of the radical separation of nature and grace. Initiated by Protestantism, the dichotomy of nature and grace seems to have important consequences for economic thou...