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About this book

If your senses can mislead you, what can you ever know for sure?

In Academica, Marcus Tullius Cicero brings a fierce Greek debate into a conversation among educated Romans. The Academy, the school Plato founded, is divided over certainty. Some thinkers urge the wise to hold back judgment. Their rivals, above all the Stoics, argue that truth lies within our grasp.

Lucullus defends the possibility of real knowledge. Cicero answers with cases where appearances deceive: an oar dipped in water looks bent. Yet doubt raises a practical problem. How can anyone act without certainty? Drawing on Carneades, Cicero explores whether more convincing impressions can guide a life when proof remains out of reach.

What you’ll discover

  • The case for certainty Follow Lucullus as he defends the claim that human beings can grasp truth.
  • An oar that deceives See how a familiar sight becomes a challenge to confidence in the senses.
  • Doubt with good humour Meet Cicero as a careful doubter who gives rival arguments room to speak.
  • Action without final proof Explore Carneades' distinction between certainty and the convincing impressions that can guide choices.
  • A school in debate Trace the clash between the Academy's doubts and the Stoic defence of knowledge.

Is it for you?

This book suits readers who enjoy sharp arguments about knowledge, doubt and evidence, and anyone curious about how ancient schools clashed. It may be less suited to those who want a smooth story, since some of the dialogue is technical and survives only in part.

What’s inside

The key ideas, in the 15-minute summary

  1. A school divided over certainty
  2. One work written twice
  3. The case for certain knowledge
  4. Why the senses cannot settle the matter
  5. Living well on the probable
  6. What the book left behind

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Philosophy & Ideas

Academica

by Marco Tullio Cicerone

Roman thinkers debate whether human knowledge can be certain.

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Academica by Marco Tullio Cicerone, the cover

From the 15-minute summary · Key idea 1 of 6

A school divided over certainty

The Academy was the school Plato founded in Athens, and it took its name from the place where it met. Plato wrote dialogues in which Socrates questions people and often leaves the question open. Later heads of the school drew a bold lesson from that habit. Arcesilaus argued that nothing can be known with full certainty, and that the sensible response is to withhold assent, which means refusing to say that a claim is definitely true.

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The author

Marcus Tullius Cicero

106 BC–42 BC · Roman statesman, orator and philosopher

Roman statesman, lawyer, orator, and philosopher.

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What is Cicero's Academica about?

It is a dialogue about whether humans can know anything for certain. Speakers argue for and against the claim that the mind can grasp truth with confidence, and Cicero defends the view that we can only reach what is probable.

Who are the speakers in Academica?

In the first version, they include Lucullus, Catulus, Hortensius and Cicero. In the revised version, the speakers are Cicero, his friend Atticus and the scholar Varro, to whom Cicero dedicated that edition.

What does Academic skepticism mean in Cicero?

It means holding back assent from claims that are not certain. The Academic does not say nothing can be true. He says certainty is not proven, and he follows the most probable view when he must act.

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