Who said "To think of what is not is to think nothing at all."?

This quote is attributed to Parmenides.

To think of what is not is to think nothing at all. - Parmenides

"To think of what is not is to think nothing at all."

Parmenides Knowledge

Philosopher Ancient Greece 515–445

"What is, is. What is not, is not."

"Being is; not-being is not."

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