This text explores the essence and legitimacy of philosophy, rejecting its interpretation as a mere tool or "servant" of other disciplines, whether in the context of medieval theology or modern specialized sciences. The author emphasizes that the significance of philosophy does not lie in satisfying individual or social needs, nor in its utility for scientific purposes. Instead, philosophy is essential because no human activity is capable of critically verifying its own legitimacy and authenticity using only the means at its own disposal. Such an examination requires external reflection, which can only be professionally provided by philosophy. Therefore, the ultimate criterion for philosophical work is not anything material or human-defined, but Truth itself, which addresses the philosopher as an absolute norm. Philosophy thus becomes the instance that subjects all human activities and reality to the higher demand of truthfulness, establishing its irreplaceable role in human thought and action.