In the two basic searches of man, for his role in existence within the Universe on the one hand, and the balance of his inner world on the other hand, the book "In the depths of the soul" by Konstantinos Lolis, through a holistic view of everything in the Universe, proposes new, documented answers.

- Man is recognized as a microcosm of the Universe: quantitative, temporal and qualitatively evolving. Thus, knowledge of Physics and Cosmology answers our eternal questions, while knowledge of human structure offers proposals and solutions for the Universe.
- Character problems are identified as consequences of incorrect emotional information we receive as children. Psychopathology always hides a deeper repressed psychological trauma that needs to be revealed in order to free ourselves from the daily negative effects of it.

As a result, in the book, in 33 logically structured topics-truths, the foundations are laid and a path is traced for the mental health and balance of the individual.