This text critically examines the concept of the Greek term 'fysis' within the context of Kratochvíl's reflections on the relationship between language and philosophy. The author challenges the strict distinction between philosophical and pre-philosophical words, arguing that a word's meaning shifts fundamentally with its application, as seen in the transition from myth to philosophical discourse in Heraclitus. Etymology is viewed as a source of 'signs' or indications that guide philosophical thought without strictly binding the philosopher. The core issue is not the inherent pre-philosophical nature of the word 'fysis', but how a thinker consciously engages with it—whether they choose to ground their concepts in etymological roots or intentionally depart from them. The text emphasizes that philosophers must evaluate the validity of linguistic structures and their utility for expressing specific ideas. If a philosopher adopts a meaning that diverges from common usage or etymological origins, they must explicitly signal this to prevent misunderstandings by readers naturally influenced by linguistic traditions.