"All abstract sciences are nothing but the study of relations between signs"

In this quote, Denis Diderot is recommending that all abstract sciences, such as mathematics, philosophy, and linguistics, are basically the research study of how signs or symbols connect to one another. He is suggesting that these sciences are not worried about concrete objects or concrete realities, however rather with the abstract principles and concepts represented by indications. Diderot might be arguing that these sciences are restricted in their capability to completely comprehend the world, as they are focused on the relationships in between indications instead of the real world itself. This quote highlights the importance of language and signs in our understanding of the world and the limitations of abstract thinking.