Parmenides

You must learn all things, both the unshaken heart of persuasive truth, and the opinions of mortals in which there is no true warranty.

— Parmenides

The only roads of enquiry there are to think of: one, that it is and that it is not possible for it not to be, this is the path of persuasion (for truth is its companion); the other, that it is not and that it must not be — this I say to you is a path wholly unknowable.

— Parmenides

For it is the same thing that can be thought and that can be.

— Parmenides

It is indifferent to me where I am to begin, for there shall I return again.

— Parmenides

Never will this prevail, that the things that are not are — bar your thought from this road of inquiry.

— Parmenides

Do not let habit, born from experience, force you along this road, directing aimless eye and echoing ear and tongue; but judge by reason the much contested proof which I have spoken.

— Parmenides

There is one story left, one road: that it is. And on this road there are very many signs that, being, is uncreated and imperishable, whole, unique, unwavering, and complete.

— Parmenides