The book is devoted to the poet of the first half of the 19th century, Ivan Kozlov, whose creative work was traditionally regarded as a psychological romanticism, while the poet himself was perceived as a translator and Russian Byronist. The author attempts to interpret Kozlov's poetry in religious and philosophical terms, revealing a close relationship of his work to the Christian (Orthodox) mentality. The analysis reveals motivational and imaginative complexes in the creative work of Kozlov focused on the texts of Holy Scripture, as well as having a projection on the Russian philosophical discourse of the XX century. The author studies the basic poetic ideas of religious and philosophical nature in comparison with the poetic ideas of V. A. Zhukovsky, examines genre transformations in lyric poetry, associated with the religious outlook of the poet. The monograph is addressed to students, teachers, experts in philology and to all those interested in the history of Russian literature.