The ontology of the natural order makes the human person a subject of rationality, authenticity, dynamism and intelligibility. These qualities necessarily and indispensably help the individual as an Acting Person to sustain the moral affinity of love, care, justice, equity and peace. With these qualities of epistemic personification and social resemblance, the Acting Person is demanded to coordinate his or her affairs and actions in effecting social order and discipline, then ethically achieving the courses of integral humanism. This is epistemological foundation of Karol Wojtyla's existential phenomenology of Acting Person as a subject of lived experience. Such philosophy recognises that the human capacity and capability have the courses of natural-moral orders by his or her natural moral reasoning and their epistemic justification. Hence, the paper questions the fate of the Acting Person in the paradox of the “modern self. It recognises that the paradox of the “modern self” as an acting agent of modern development is dependent on a world that is demarcated on the values of the Culture of War and the Culture of Peace. The Acting Person as a “modern self” rather than as an “integral self” is more concern about what he or she offers to the world by his or her very self irrespective of the moral means of achieving such development. Adopting phenomenological mode of analysis, the paper concluded that the recognition of the good and the bad, the right and the wrong, resides in the rational capacity of the Acting Person in justifying his or her moral experiences, and then develop the social consciousness to sustain his or her selfauthenticity and self-subjectivity through actions that morally make the person more human
Keywords: acting, epistemic, justification, modern, morality, paradox, person