Quote by Parmenides: “There is only one road remaining, that It Is. On this road there are very many signs.”

Parmenides declares that the only true path to understanding is through the affirmation of eternal existence, asserting that reality is singular and unchanging. He implies that by accepting this truth, one finds ample evidence validating the perpetual nature of being, despite the changing appearances of the world.

This metaphor from his poem *On Nature* describes the journey towards philosophical truth. Parmenides urges followers to recognize that true reality ('It Is') is constant, contrasting with the deceptive and ever-changing world perceived by the senses.

Greek philosopher from Elea, active around 480 BCE, who argued that all change and plurality are illusions and that reality is a single, eternal, unchanging whole. His philosophical poem On Nature survives in fragments and directly influenced Plato and many later Western philosophers. He is considered the founder of ontology, the study of being itself.