The book "Selected chapters from the Principles of Philosophy" is one of the most significant works of René Descartes, an outstanding French philosopher, mathematician and philosopher of the 17th century. In this book, the reader will be able to feel the depth and uniqueness of the author's thoughts on nature, man, religion and reason. Descartes offers his view on the structure of the universe and the essence of existence, revealing important principles of philosophy, which are reflected in his famous statement "Cogito, ergo sum" (I think, therefore I am). This book is an important source for understanding the philosophical thought of the Enlightenment period and will be useful for both beginners in philosophy and experienced professionals.