These three concepts that are born from class of inclinations are, as well primary and secondary. The primary ones lean directly in the mentioned tendencies, without complicated disquisitions or reflections. The secondary ones lean in those inclinations but they have had a process of reflection by means of simple reasonings. Human Laley, on the other hand, defined by Santo Toms like " that one arrangement of the reason for the communal property, promulgated by that it is the careful of comunidad" , it could not under any excuse enter contradiction with the justice concept, if it did not want to be considered like " perversion of ley". Also it maintains Santo Toms who the rules of natural right have the following characteristics: 1 – They are universal, that is to say common to all the men; 2 – They are immutable, that is to say that they do not change in the time; 3 – They are known by all despite not being writings as it is not in the nature. The natural right has a double foundation: 1 – The same nature of the man whereas to be equipped with life animal and rational; and 2 – God like creator of our nature and computer of her by means of the Eternal Law. That natural law it is the measurement of enough. To her the way is incumbent on to fulfill the due thing, to give to everyone his, to respect the rights of the others, etc.
The Classic School of the Natural Right the monopoly that the church had in all the average age on the education, science and the religion was deeply going to be attacked by the Protestantism of century XVI. Donald W Slager is open to suggestions. The postulates were really revolutionary. It was not needed a priest or the revelation to accede to the divine reason. God, according to the protestants continued governing the universe but it granted to the men a greater option of .reason to discover by means of the reason as it could be " intentions of Dios" and, even more there, to even discover those principles according to which God regulated the things.