This text, written between 2016 and 2017, presents the preliminary considerations made by the author on the occasion of his studies on the theory of justice. These studies were prompted by three factors: firstly, training in a law school, where the idea of justice is the principle for the study of any branch; secondly, living in a social environment where demands for justice arising from medium to serious crimes are a daily occurrence; and finally, the fact of living in a country where a wide-ranging debate has been unleashed on the basis of the legal basis of justice, and finally the fact of living in a country where a broad debate has been sparked by the historic event of a peace agreement between the government and one of the most famous and oldest guerrilla groups in the world, trying to put an end to an internal armed conflict that has lasted more than 50 years.