Faced with the radically positivist attitude that currently manifests itself in much of the legal doctrine, which incurs again in the cult of the text of the law, in this work, its author claims a return to natural law, although updated, not unreal, not ahistorical, but attentive to the current social reality and to the positive norm itself; nor would it be a teological iusnaturalism, of religious overtones, but inspired by the very principles and legal values that, in part, the constitutional and international texts on the person consecrate in a necessary, but not easy, balance between security and justice. [ABSTRACT FROM AUTHOR]