This text explores the nature of human thought through the concepts of questioning and problematization. It analyzes how the act of questioning can open the mind to truths that are not already possessed or derived from existing knowledge. These insights, referred to as "the fourth," often cast a surprising light on previous assumptions, revealing their contingency or problematic nature. The author emphasizes that this openness and readiness to listen to the "voice of truth" is an elementary necessity that must not be confused with established philosophical positions such as transcendentalism, deism, or idealism. Any attempt to define, limit, or manipulate "the fourth" results in a reduction or loss of genuine openness. Furthermore, the text suggests that not every question is legitimate, as questioning itself involves "positing" or making assertions. This inherent positivity can become a source of error if it closes off the very openness it seeks. Ultimately, true questioning requires a radical orientation toward a truth that transcends the subject's control and existing cognitive frameworks.