Heraclitus portrait, flat vector illustration

heraclitus, greek philosopher, ancient philosophy, presocratic thinker, ephesian philosopher, philosophy of change, unity of opposites, river metaphor, logos concept, fire element, cosmic order, flux doctrine, natural philosophy, metaphysics, ontology, early greek thought, philosophical fragments, aphorisms, wisdom sayings, paradox ideas, harmony and conflict, world process, universal law, rational principle, stoic influence, western philosophy, classical greece, philosophical inquiry, existence theory, reality concept, change and stability, dialectical thinking, ancient wisdom, philosophy history, cosmology ideas, human nature, knowledge theory, philosophical tradition, ethics reflection, intellectual heritage