Summary
Summary of Parmenides
Key ideas
Key idea 1
One thing can raise opposite claims
A young Socrates listens as Zeno defends Parmenides, who holds that what is must be one and unchanging. Zeno argues that if things are many, they must be both like and unlike, which he treats as impossible. Socrates notices that the two thinkers are defending the same position from different directions.
The meeting puts a central question in view: can something have opposite qualities without contradiction? Before Socrates offers his own account, he must explain why the many things we encounter need not be absurd.
Key idea 2
Forms explain how things share qualities
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Key idea 3
Sharing a Form creates fresh puzzles
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Key idea 4
Objections need not mean abandoning Forms
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Key idea 5
Pure unity leaves nothing to describe
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Key idea 6
Conflicting deductions invite different interpretations
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Key idea 7
Test an idea in both directions
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The rest of the summary, written and spoken, and the whole book: free to start.
Read the rest freeWho it’s for
For readers who have met Plato's Republic or Phaedo and want to see him question himself, and for anyone curious about logic, being and unity.
What this book is
Parmenides is a dialogue written by Plato, probably in the middle of his career, in the fourth century BC. It imagines a meeting in Athens between the young Socrates and two great thinkers from southern Italy, the elderly Parmenides and his follower Zeno. The scene is made up, but the question is real. What does it mean to say that something is, and how can many things share one nature?
The dialogue is unusual because Plato lets the old master attack Plato's own best-known idea, the theory of Forms. Then he sets an exercise in reasoning. You get a rare thing: a great philosopher testing his own theory in public. Along the way you meet the third man argument, the puzzle of the One, and a method of thinking that shaped later philosophy. Its moves can be followed. Let us begin with the meeting itself and the first answer Socrates gives.
In this summary
- 1A young Socrates meets two old mastersFree
- 2Forms answer Zeno, but invite hard questions
- 3How can many things share one Form?
- 4Why Parmenides still defends the Forms
- 5The One taken alone has no being
- 6Opposites follow either way, and what lasts
Key point 1 of 6
A young Socrates meets two old masters
The dialogue is framed as a story passed down through several people. A man named Cephalus travels from Clazomenae to Athens and asks Antiphon to retell a famous conversation. Antiphon learned it long ago from Pythodorus, a friend of Zeno who was present. Antiphon is the half-brother of Plato's own brothers, Glaucon and Adeimantus, so Plato places his family inside the chain of memory.
The meeting itself is set during the great festival of the Panathenaea. Parmenides is described as about sixty-five years old, with white hair and a noble look. Zeno is nearly forty. Socrates is very young. Parmenides was the philosopher who argued that what is must be one and unchanging, and that change and plurality are illusions of the senses. Zeno was famous for defending him by showing that the opposite view leads to absurd results.
Zeno reads aloud from a book of his. Its argument runs like this. If things are many, then they must be both like and unlike, and that is impossible, so things are not many. Socrates listens closely and then says that Zeno and Parmenides are saying the same thing in different words. Parmenides says all is one, and Zeno shows that the many cannot be.
Zeno answers that his book was a youthful work, meant to defend Parmenides against those who mocked him. He did not write it to claim fame as a teacher. Plato uses this scene to set up the problem. Before any theory of Forms appears, the reader sees what is at stake: whether it is absurd for one thing to hold opposite qualities.
That’s 1 of 6 key points.
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Check yourself
How does Socrates answer Zeno's puzzle about opposite qualities?
Right. “He separates the Forms, such as likeness, unity and plurality, from the things that share in them.”Not quite. “He separates the Forms, such as likeness, unity and plurality, from the things that share in them.”
Why does Parmenides resist abandoning Forms despite his objections?
Right. “He says that someone who denies Forms altogether will have nothing to fix his thought upon.”Not quite. “He says that someone who denies Forms altogether will have nothing to fix his thought upon.”
What method does Parmenides recommend for testing a claim?
Right. “Suppose also that it is not, and trace the results of both views, for the thing itself and for everything else.”Not quite. “Suppose also that it is not, and trace the results of both views, for the thing itself and for everything else.”
Who’s who
- Parmenides
- An elderly philosopher visiting Athens, he questions young Socrates about Forms and leads an extended exercise in reasoning.
- Socrates
- A young thinker who answers Zeno with the theory of Forms and faces searching questions from Parmenides.
- Zeno
- A follower and friend of Parmenides whose arguments about multiplicity prompt Socrates to distinguish Forms from particular things.
- Cephalus
- A visitor from Clazomenae who seeks out Antiphon in Athens to hear the conversation involving Socrates.
- Antiphon
- The narrator approached by Cephalus, he learned the conversation through repeated hearings from Pythodorus.
- Pythodorus
- A friend of Zeno who witnessed the philosophical meeting and later recounted its arguments to Antiphon.
About this edition
Every format is free to start, and print and large print are at cost.
- LengthAbout 36,000 words
- Reading timeAbout 2 h 25 min
- Listening time4 h
- FormatseBook, large-print eBook, audiobook, 15-minute summary
- LanguagesEnglish and 12 other languages
Questions about Parmenides
What is Plato's Parmenides about?
It is a dialogue in which the young Socrates presents the theory of Forms, and the old philosopher Parmenides raises objections to it. It then works through an exercise on the nature of the One and being.
Who are Parmenides and Zeno in the dialogue?
Parmenides was a thinker from Elea in southern Italy who argued that what is, is one and unchanging. Zeno was his follower, famous for puzzles that tried to show the many cannot exist.
What is the third man argument?
It is the objection that if a Form explains why many things share a quality, a further Form is needed to explain what the Form and those things share. This leads to an endless regress.
Is Parmenides a true conversation and when was it written?
No. Plato invented the meeting, which is told at several removes. He wrote it in the fourth century BC, probably in the middle part of his career, and it is treated as a later dialogue.
Is Plato's Parmenides hard to read?
No. It starts with a story about a meeting in Athens, with a young Socrates and two old masters from Italy. Zeno reads aloud from his book, and each step of the talk is easy to follow, one question at a time.
