This is an exercise of introspection around concepts which the author uses to delimit a personal malaise. It began because it was necessary to comply with an exercise of philosophical inquiry and this discomfort shown itself as an obstacle to such an inquiry. Which discomfort was deal with? The one that seemed to come from a radical uncertainty regarding the place the author occupied in the world. This uncertainty, however, was not revealed until a reflection was made on the conceptual system with which was organized a more superficial experience: the inability to sustain the effort and concentration on any inquiring task. The exercise revealed to the author that the immediate experience was, in fact, mediated by the concepts with which it was organized. This revelation claimed for a foundation of such concepts since, in this, they were revealed equivocal. It was that revelation an opening to philosophy and, for the author, as a necessary condition for genuine philosophizing. Therefore, it was concluded that radical reflection on one's concepts was a path to philosophical inquiry. While this revelation was of great existential value to the author, it contributes very little to the academic philosophical community.