Knowledge in the first truth according to Thomas Aquinas’ ultimate foundation of the possibility of science

In this article we try to clarify St. Thomas’ assertion that we know in first truth and show that this reference to first truth is necessary for the ultimate foundation of science.
An attentive analysis of the question of truth will allow us to go back to first truth as the foundation of all truth and, from there, show in what sense the truth of our understanding depends on it. Thus, it will be justified that, in order to account for our science, this reference to first truth is necessary.