Saint Augustine of Hippo (354 - 430) is a saint, father and doctor of the Catholic Church.

The "Doctor of Grace" was the greatest thinker of Christianity of the first millennium and according to Antonio Livi one of the greatest geniuses of humanity. A prolific author, he devoted a large part of his life to writing about philosophy and theology.

This book takes the form of an "internal dialogue" in which questions are posed, discussions are held and answers are provided, leading to self-knowledge. The first book begins with an inner dialogue that seeks to know a soul. In the second book it is clear that the soul that Agustín wants to know is his own soul.