The proposed work of the famous German philosopher is quite suitable for the role of a calling card of a thinker. It marks the beginning of the development of his work, while maintaining a distance from his earliest works; it was reprinted more than once and found life abroad. In relation to existential philosophy, O. F. Bolnov acts both as a systematizer, and as a modernizer, and as an “initiator”, who does not want to “slide into an objectivism that is far from life” and asserts that “the final unity nevertheless comes from the plane of the existential.” Who is the work intended for? First of all, we are, of course, talking about the university environment and scientists. This publication, albeit with a slight delay, is addressed to all those who are specifically interested in existential philosophy and will not deny themselves the pleasure of familiarizing themselves with the interpretation of its key concepts in this translation; Along with this, this essay can find a wide response among the student audience and among all those who seek to understand the conceptual structures of this famous philosophy - due to its systematic, concise, and intelligible nature, it can be perceived as a textbook on one of the sections of Western European thought of the 20th century.< /p>