This text explores the multifaceted meanings of the Greek term LOGOS, focusing specifically on its role in shaping conceptual thinking. The author analyzes the nature of the concept (conceptus) as a tool that attempts to fit the diversity of reality into an order of constructed models, which is a fundamental requirement for scientific competence. The reflection rejects traditional notions of innate ideas, highlighting instead the role of convention (convenientia). However, it emphasizes that these conventions, whether in Euclidean or non-Euclidean geometry, are neither arbitrary nor capricious. Every science is presented as a human creation and a set of rules that must be devised and subsequently accepted by consensus. The key criterion for evaluating a science is not its natural origin, but the quality of these intellectual constructions and their practical consequences. Thus, the text provides a profound insight into the epistemological foundations of professional knowledge, perceiving it as a disciplined human creation aimed at achieving specific goals and outcomes.