Who said "It is necessary to speak and think what is."?

This quote is attributed to Parmenides.

It is necessary to speak and think what is. - Parmenides

"It is necessary to speak and think what is."

Parmenides Truth

Philosopher Ancient Greece 515–445

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

"Being is; not-being is not."

"One should both say and think that Being is."

"How could what is perish? How could it come to be?"

"Lucy, you got some 'splainin' to do!"

"You must always be honest with the people you love."

"Truth always comes out in the end."

"Honesty is always the best policy."