This text analyzes Nietzsche's statement from the preface to the "Revaluation of All Values," asserting that one must never ask whether truth is useful or fatal. The author refines this formulation by distinguishing between concrete true judgments and Truth itself as an abstract principle. While the utility or disutility of specific truths in a given context can be legitimately examined, Truth as such remains a binding authority that transcends situational application. The text argues that the relationship between Truth and utility is fundamentally inverted: it is Truth that serves as the criterion for what is genuinely useful, rather than utility serving as a measure of truth. Understanding the "true state of affairs" is always useful in the highest sense because it liberates the individual from illusions. The author critiques the notion that certain illusions are necessary for life, labeling such views as prejudices that fail when confronted with the light of Truth. Ultimately, the study defends the ontological primacy of Truth over pragmatic concerns and emphasizes its liberating power and objective validity.