For Being is, and non-Being is not.
ἔστι γὰρ εἶναι, μηδὲν δ' οὐκ ἔστιν

Philosophers
Parmenides
A pre-Socratic philosopher born in the late 6th century BCE in the Greek colony of Elea in southern Italy. In his didactic poem On Nature, Parmenides declared 'what is, is; what is not, is not,' dismissing change and plurality as sensory illusion. His ontological monism became the foundation of the Eleatic school, and through Zeno's paradoxes and Plato's Theory of Forms, it established the starting point of Western metaphysics. He is often called the founder of ontology.
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Parmenides's Other Quotes
Related Quotes
All things flow.
-- Heraclitus
Everything perfect proceeds outward from its own perfection.
-- Proclus
All things are in all things, but in each in the way that suits its own nature.
-- Porphyry
For whom emptiness works, everything works. For whom emptiness does not work, nothing works.
-- Nagarjuna
To study the Way is to study the self. To study the self is to forget the self. To forget the self is to be enlightened by the ten thousand things.
-- Dōgen
Being determines consciousness.
-- Karl Marx