Frankl's book on the anthropological foundations of psychotherapy has become a classic of logotherapy. In it, the author presents a comprehensive yet well-structured picture of humanity that goes far beyond conventional psychological-anthropological models and delves into the dimension of the specifically human phenomenon. The book includes two early works by Frankl, Homo patiens and The Unconditional Man, as well as a number of more recent writings that demonstrate how Frankl's views have evolved. In this way, the book has become an interdisciplinary synopsis in the best sense of the word, illuminating the timeless problems of humanity.