This text explores the ontological role of the subject, conceptualizing it not as an abstract point but as a decisive center of communication within true events. The subject serves as a vital mediator between the internal and external dimensions of an event, facilitating the processes of exteriorization and interiorization. A central theme is the subject’s function as the site of transition between temporal modalities: from potentiality to actuality and finally to pastness. The author challenges conventional notions of transitions between entities, arguing that such movements are grounded in the shift from the "not yet" to the "here and now" and the "no longer." Furthermore, the text deconstructs the illusion of permanence or remaining unchanged. It posits that any duration or persistence must be actively maintained by a subject at some level of the event process. Without this active mediation, events would lapse into nothingness rather than merely passing into the past. Thus, the subject is presented as a fundamental constitutive element that ensures the continuity and structure of reality across different levels of existence.