The Introduction begins with an attempt to understand the concept of nihilism itself. Six different aspects of the concept are identified and briefly explored. While nihilism is usually associated with twentieth-century schools, it is argued that in fact the true origins of modern nihilism can be found in the rapid development of the sciences in the Enlightenment. The scientific perspective revealed the seemingly insignificant role of humans in the universe and led to a struggle with nihilism, which became an important topic for many thinkers in the nineteenth century. Five theses are outlined: (1) the problem of modern nihilism arose in the wake of the scientific development of the Enlightenment; (2) nihilism was not a local issue confined only to a specific place or country, but instead was something central to the general Zeitgeist of the entire nineteenth century in Europe and the West; (3) nihilism was not a problem confined to philosophy, but it received detailed treatment in works of poetry, drama, and other forms of literature; (4) the problem of nihilism is more widespread than has been acknowledged; and (5) the discussions of nihilism in the nineteenth century anticipate the key topics of the existentialist movement.