This study is a theological-critical investigation of the argument for the existence of God and the doctrine of God from the human reason and the relation between natural theology and revealed theology in the works of some Dutch professors of theology or philosophy from 1650 to 1750. In this period of rationalism and enlightenment the Cartesianism had much influence on the Dutch theological world, but there was also put up a vigorous fight against it. Generally speaking it can be ascertained, that before Descartes the schooling in logic and ideology was dominated bij the relevant theses of Aristotle; also concerning natural theology the aristotelean-scholastic method was in force. In accordance with the investigation above-mentioned in this study is inquired what philosophical system can be found in eight books of different authors on natural theology. These are the names of the authors, the relevant books and the results of the investigation: