Heraclitus

Heraclitus of Ephesus (c. 535–475 BCE) was a pre-Socratic Greek philosopher from the Ionian city of Ephesus. Little is securely known about his life, but he is traditionally associated with an aristocratic background and a solitary, critical temperament. His thought survives only in fragments, preserved by later writers, from a work often referred to as *On Nature*. Heraclitus is famous for emphasizing change and process—later summarized as the idea that everything flows—and for his concept of the *logos*, an underlying account or principle that orders the world. His dense, aphoristic style earned him the nickname “the Obscure.”