Poem of Parmenides (Diels-Kranz collection)

Die Fragmente der Vorsokratiker, first compiled by Hermann Diels and later revised by Walther Kranz, is the standard reference collection of Presocratic evidence. Parmenides is chapter 28, so his lines are cited as DK 28 B followed by a number, and reports about him as DK 28 A. The poem itself, traditionally called On Nature, does not survive intact. The profile title therefore names an editorial framework, not a book Parmenides wrote in this form. Exact numbering and the edition used should always be stated.

In the Diels-Kranz system, A items are testimonia, meaning ancient reports about a thinker's life and doctrines, while B items are purported direct quotations. For Parmenides, the B fragments contain the proem, the Way of Truth, and parts of the Way of Opinion. Simplicius preserves the longest continuous extracts, with smaller pieces coming from authors such as Sextus Empiricus and Plutarch. Because the boundaries of quotations are editorial judgments, other editors sometimes divide or order the lines differently.

Later editors, such as A. H. Coxon, Daniel Graham, and the compilers of Kirk, Raven and Schofield, provide concordances to DK numbers while sometimes reordering lines or adopting different readings. Where editors disagree, usually over a line's position or a textual variant, the DK numbers remain the common currency for citation. I cannot verify specific differences line by line, so readers should check each editor's concordance directly.

The goddess presents two routes of inquiry: that it is and cannot not be, and that it is not and must not be. The second is rejected as unthinkable. From the first, Parmenides derives signs of what-is: it is ungenerated, imperishable, whole, unmoved, and complete. Scholars dispute whether the argument concerns existence, predication, or identity, and whether it implies strict monism, as Plato and Aristotle suggest, or a pluralist reading such as Patricia Curd has defended.

After the Way of Truth, the goddess gives a cosmology built on opposed principles, often described as light and night, which she presents as the best available account of mortal belief. Karl Popper read it as a serious physical theory, while others treat it as a dialectical foil or a deceptive foil to the truth. The fragmentary evidence is too sparse to settle the matter.

For text, translation, and commentary, A. H. Coxon's edition, revised by Richard McKirahan, is a standard scholarly choice. Daniel Graham's The Texts of Early Greek Philosophy and Kirk, Raven and Schofield give English texts within wider surveys, while John Palmer's Parmenides and Presocratic Philosophy and Alexander Mourelatos's The Route of Parmenides are major studies. Readers should always confirm which edition's numbering a citation follows.