This philosophical reflection delves into the examination of existence, non-objectivity, and their mutual relationship within the ontological structure of a true being. The author argues that existence is a predicate belonging exclusively to true beings, which raises questions about the status of pure non-objectivities that are real yet, strictly speaking, non-existent. A central element of the discussion is the distinction between the internal (non-objective) and external (objective) aspects of a being, neither of which fully exhausts its essence. Existence itself is defined as a continuous activity and a fluid movement between these two spheres, a capacity reserved solely for the subject. This process unfolds within a unique, actual presence, outside of which a being cannot exercise its existence. The study concludes that the subject must be conceived dialectically as a unity of internal and external, existing and non-existing, thereby overcoming traditional static views of being and replacing them with a dynamic model of subjectivity and temporality rooted in the present moment.