The book presents an original approach to Heidegger's philosophy based on its phenomenological interpretation. The point of departure of it is the text of the 1930 lecture Vom Wesen der Wahrheit.
Both the lecutre, as well as the whole of Heidegger's way of thought is read through the prism of three concepts: origin, phenomenon and world. It is argued that the main question of Heidegger's thinking is from the very beginning to its end is the question of the origin of phenomenality.
The close intratextual and intertextual reading of Vom Wesen der Wahrheit is accompanied by the first drafts of a project of my own phenomenological philosophy introduced as "transcendental phenomenogony".