The study is devoted to an underdeveloped problem - the terminology and nature of the philosophical (epistemic) search in early Greek philosophy. The author's focus is on the work of Heraclitus and Parmenides, which is considered in a broad historical and philosophical context. The study is based on a detailed analysis of the semantic field of "search" - didzesisadzetesis. The monograph reflects the modern level of criticism of fragments of early Greek philosophers, the latest achievements of heraclite and parmenide studies are discussed in detail. The author reasonably conducts a thesis on the rational nature of the philosophical search in the teachings of early Greek thinkers. The book is addressed to specialists in epistemology and the history of ancient philosophy, as well as to all readers interested in philosophy.