The book "Friedrich Nietzsche in his writings" is an important source for those interested in the philosophy of Friedrich Nietzsche. Written by Andreas-Salome and Louise von Zalome, Nietzsche's close friends and collaborators, it offers a unique insight into the life and work of this great German thinker. The authors examine not only Nietzsche's philosophical works themselves, but also the influential ideas that permeated his life and work. They reveal not only the outer world of the beloved philosopher, but also his inner struggles and experiences. Readers will have the opportunity to deeply understand Nietzsche's inner world, which was reflected in his works. This book opens up new facets of understanding and interpretation of Friedrich Nietzsche's work, emphasizing his humanity and feelings that influenced the formation of his philosophical concepts. "Friedrich Nietzsche in his works" will be a valuable addition to the library of anyone interested in the life and work of this outstanding thinker.