Quote by Parmenides

"The rational is real; the irrational is impossible."

Parmenides
Philosopher Ancient Greece 515–445

More from Parmenides

"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?"

All quotes by Parmenides