The purpose of the textbook "Principles of Philosophy" is to demonstrate that Philosophy is a set of questions or reflections posed by a thinking individual, concerning their relationship with themselves, with others, with nature, with the universe, and with God. All these questions are systematized by philosophers and daringly answered based on logical arguments. The questions, along with the answers, create philosophical systems. The ultimate goal of philosophical systematic contemplation is not only to satisfy the inherent need of humans for answers to their questions, but primarily to awaken thought, so that it does not accept anything without reflection and critical disposition.

This particular aid seeks to highlight the purpose of this textbook. Thus, in each chapter, the main philosophical concepts of the authors' text are highlighted and explained, the texts that constitute the sources of information are commented on from a philosophical perspective, as well as the images-paintings and cartoons.

The summaries of each chapter and section are comprehensive and clear. Thus, they can be used not only for a general overview but also for more practical teaching needs. In cases where there is not enough time for the detailed teaching of a chapter with its sections, the summaries provide sufficient information and fill the gap.

The answers to the questions in the textbook and the teacher's book are based on the specific philosophical theory of each chapter, as it emerges from the authors' text, the sources, and the paintings. In other words, from the entire multifaceted text of the chapter.

(from the author's preface)