The first volume of the Works of Florensky (1882-1937), an outstanding Russian thinker, philosopher and theologian, includes works from 1903-1909, representing various aspects of his talent, unique in its breadth and depth. Published philosophical, mathematical, theological, hagiographic and literary critical materials make it possible to introduce into scientific and cultural circulation works that have long become a bibliographic rarity. A significant part of the works is printed from the author’s manuscripts, and was also verified against the collection “Experiments 1. 1903-1910” corrected by P. A. Florensky himself.