This text explores the profound interconnection between the concept of responsibility and the conception of the subject, focusing specifically on the issue of diachronic identity. The author identifies a central problem: how a human subject at time B can be held responsible for actions committed at an earlier time A. He critiques classical metaphysics for its attempt to solve this by seeking an unchanging essence within the subject, an approach he deems absurd and underdeveloped as it fails to bridge the gap between a supposedly permanent core and the variable phases of life. The author argues for an expansion of the concept of the subject and responsibility beyond the human sphere, regardless of whether consciousness is present at lower levels. For conscious subjects, however, the capacity to anticipate the consequences of their actions becomes a moral duty and a constitutive element of responsibility. This perspective demands a fundamental reassessment of traditional ontological assumptions regarding identity and temporal continuity, offering a more dynamic framework for understanding the ethical dimensions of subjectivity and existence.