The article is a complete version of the speech at a conference organized by the Department of p\\Philosophy of North-Eastern Federal University in Yakutsk, dedicated to the 200th anniversary of Friedrich Engels, Karl Marx’s associate in the development of dialectical-materialistic philosophy. It justifies the Friedrich Engels’s idea about the unity of worldview and methodology, which allows us to interpret philosophy as a worldview that develops into a methodology and methodology based on the worldview. In this regard, didactic material on the topic of ‘worldview’ was analyzed and, using the classical, textual works of Friedrich Engels, the specifics of the dialectical-materialistic worldview as the basis of dialectical-materialistic methodology are shown. It is argued that dialectic logic in the Engels interpretation means the transformation of philosophy into the science of thinking. The article highlights the praxeological aspect of the unity of worldview and methodology, where Engels’s reasoning actualizes, the need for worldview - the visual certainty of modern science as one of the patterns of the formation of the paradigm of synergistic thinking.