Book summary

ピレボスのあらすじ

著者：プラトン

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8 key ideas
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Socrates and young Protarchus put pleasure on trial and ask whether any life without thought is worth choosing.

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ピレボスの概要

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読書時間: 約2 h 55 min2 h 15 min fast, 3 h 25 min slow
所要時間: 41,100語
ライブラリ内の難易度: 標準 longer sentences, everyday words
初版刊行年: 紀元前350年頃by プラトン

Reading time at 238 words a minute (fast 300, slow 200). 古典を読むのにかかる時間 · 更新日 22 October 2026

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ピレボス in short

Philebus asks which matters more for a good life, pleasure or wisdom. Socrates tests both by imagining each alone. A life of pure enjoyment with no mind cannot even know it is enjoying itself, and a life of pure thought with no feeling attracts nobody.

What ピレボス is about

What would you choose: a life of endless pleasure with no mind at all, or a life of perfect thought with no feeling? In Philebus, Socrates puts that very choice to a young man named Protarchus, who finds neither life worth choosing.

Philebus is a dialogue by Plato, who died in 348 BC. It asks what makes a human life good. Philebus holds that enjoyment is the good, while Socrates holds that wisdom serves us better. You get a method for testing any big claim, a study of pleasure, and a surprising ranking of life's goods, with pleasure in fifth place.

対象読者. Readers who enjoy watching an idea tested from every side will like this dialogue. It suits anyone curious about happiness, pleasure and the good life, and lovers of Socrates and his sharp questions.

The 8 key ideas

Key idea 1 · free to read
Pleasure and wisdom meet as rival claimants
The dialogue opens in the middle of a quarrel. Philebus has claimed that enjoyment and delight are good for every living creature. Socrates answers that wisdom, understanding and memory are better. Philebus has handed the argument to Protarchus, a young man who now defends pleasure.
Socrates sets the terms with care. They are looking for a state of the soul that makes people happy. A third state might beat both claimants. If it does, the winner is whichever of the two sits closer to that third thing. This keeps the contest honest.
His first point is that one name can hide many things. The self-indulgent man enjoys himself, and so does the self-controlled man, yet their enjoyments are opposites. Protarchus replies that pleasures are pleasures whatever their source. Socrates answers that colour is colour too, yet black and white stand opposed.
Before arguing about a word like pleasure, ask what it actually covers. A single word can hide many kinds, so test the kinds before you judge the whole.
2
Divide a subject into kinds and count them
Socrates names a puzzle about the one and the many.
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3
Neither pure pleasure nor pure thought makes a good life
Socrates first agrees with Protarchus on what the good must be.
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4
Everything divides into limit, the boundless, mixture and cause
To rank the rivals, Socrates lays a foundation.
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5
Desire begins in the soul and pleasures can mislead
Socrates now studies where pleasure and pain come from.
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6
The strongest pleasures are mixed with pain
Socrates takes up a view held by certain students of nature, who say that what people call pleasure is only escape from pain.
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7
Pleasure is a process while knowledge seeks being
Socrates recalls clever thinkers who teach that pleasure is always a process of coming to be and never a being.
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8
Measure, beauty and truth outrank pleasure and mind
Now the mixing begins.
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『ピレボス』についての質問

What is Plato's Philebus about?

Philebus asks what makes a human life good. Socrates and Protarchus weigh pleasure against wisdom, test each alone, and then rank the elements of a good mixed life, giving pleasure a lower place than mind.

Who are Socrates, Protarchus and Philebus in the dialogue?

Socrates leads the inquiry and defends wisdom. Philebus, who praises pleasure, goes silent early on. His young friend Protarchus takes over his side and answers Socrates for most of the dialogue.

What does the oyster life mean in Philebus?

Socrates imagines a life of great pleasure with no mind or memory. Such a creature could not know it was enjoying itself or recall past joy, so it lives like an oyster, not a human being.

What is the main message of Philebus?

The good life is a mixture of pleasure and understanding, held together by measure, beauty and truth. Pleasure alone is not enough, and wisdom has the closer claim to what makes the mixture good.

What are the four kinds of being in Philebus?

Socrates divides things into the unbounded, the limit, their mixture, and the cause that brings that mixture about. Mind falls under cause, while pleasure falls under the boundless.

この版を引用します

Plato. Philebus. Library of Alexandria, 2026, libraryofalexandria.com/products/philebus.

Plato. (2026). Philebus. Library of Alexandria. https://libraryofalexandria.com/products/philebus (Original work published ca. 350 B.C.E.)

Plato. Philebus. Library of Alexandria, 2026. https://libraryofalexandria.com/products/philebus.

@book{plato2026philebus,
  author = {Plato},
  title = {Philebus},
  publisher = {Library of Alexandria},
  year = {2026},
  url = {https://libraryofalexandria.com/products/philebus},
  note = {First published ca. 350 BCE}
}