This text explores the ontological nature of true being and its inherent, inseparable relationship with subjectivity. The author posits that every authentic being must actively establish and maintain its own subject, effectively becoming that subject through the continuous exercise of its existence. A primary consequence of this proposition is that a true being can never be reduced to a mere "object" for another being without undergoing significant degradation or distortion. Interaction between true beings is fundamentally bidirectional, requiring the mutual engagement of both subjects involved. Furthermore, the text challenges the traditional philosophical notion of the "thing-in-itself" (an sich), suggesting that a being in total isolation is merely virtual. Actual existence is realized through being-for-others and through active interaction with the surrounding environment. While a being always transcends its external manifestations, this internal "surplus" cannot be captured by traditional categories of "in-itself" or "for-itself." The reflection moves toward a dynamic, relational understanding of existence where the subject is central to the realization of reality.