In the book "Religious spirit of the Slavs. Three lectures delivered during the Great Lent of 1916" author Nikolay Velimirovich examines the features of the religious worldview of the Slavs. The author explores the great importance of Christianity for the culture and history of the Slavic peoples, reveals the peculiarities of their spiritual development and the influence of religion on the formation of national consciousness. Through the lens of enlightenment and faith, the author will try to depict the complex world of religious ideas and rituals of the Slavic peoples, emphasizing the historical context and specifics of the development of religious and spiritual life among the Slavs.