The claim of the present article is that human mortality makes a case for the discovery of the immortal nature of the person. Based on a clear distinction of the concepts of the human being and the person, human beings and persons are considered immortal insofar as both entities evidently do not qualify for a definition as living systems. On the one hand, human beings are presented as neither lifeless nor living systems. On the other hand, persons are introduced as lifeless systems and, as a result, immortal system. This claim is extended by the statement that, even if supposed to be living systems, persons could be considered at least potentially immortal, which is illustrated by a brief and proxy case of the person of Karl Marx.