Abstract: Kantian ethics is based on principles that search for their basis in pure reason and in its conceptual structure that is independent of experience and the self-representations that accompany it, rejecting nature or realistic experience as its starting point. Therefore, it was natural that the starting point for it would be a purely metaphysical idea: “freedom”, without which it is impossible to talk about will. Duty, as a coercion exercised by reason on free will, is embodied in absolute moral commands; It is the same commands that make a person a moral legislator, who is full of the “personality” characteristic because he respects the moral law issued by him as a rational being and is distinguished from other beings by his moral dimension. Through this respect for the moral law, the person acquires a dignity that elevates him among all beings, and makes him an end in himself. the nature of the interdependence that combines those features; It is a synergistic interdependence, and freedom and will, and duty and its accompaniment to responsibility, respect and dignity can be considered traits without which the Kantian moral person cannot be achieved; So that a person is not a person unless he carries attributes that elevate him above his material existence in nature and above other beings belonging to it.