Think Again: The Power of Knowing What You Don’t Know

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THE MILLION-COPY BESTSELLER If you can change your mind you can do anything. Why do we refresh our wardrobes every year, renovate our kitchens every decade, but never update our beliefs and our views? Why do we laugh at people using computers that are ten years old, but yet still cling to opinions we formed ten years ago? There’s a new skill for the modern world that matters more than raw intelligence – the ability to change your mind. To have the edge we all need to develop the flexibility to unlearn old beliefs and adapt when the evidence and the world changes before us. Told through fascinating stories, informed by cutting-edge research and illustratedwith amazing insights from Adam Grant’s conversations with people such as Elon Musk, Hilary Clinton’s campaign team, top CEOs and leading scientists, this is the ultimate guide to keeping your thinking fresh, learning when to question your ideas and update your own opinions, and how to inspire those around you to do the same.

  • Author: Adam Grant
  • Publisher: Random House
  • Published: 2021-02-04
  • Pages: 240
  • ISBN-13: 9780753553909

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Author

Adam Grant

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Summary

What the internet says

Aggregated insights from reviews and discussions across the web.

Overall reception: Mostly positive

Think Again: The Power of Knowing What You Don't Know by Adam Grant is overwhelmingly well-received across online platforms, with readers praising it as a transformative guide to intellectual humility and cognitive flexibility. The book became an instant #1 New York Times Bestseller and is frequently described as a worthy successor to Daniel Kahneman's Thinking Fast and Slow, but more accessible. Reviewers consistently highlight Grant's ability to challenge readers to detach their sense of self from their beliefs and embrace the mindset of a scientist rather than a preacher, prosecutor, or politician. One reviewer called it "probably my book of 2021," emphasizing its focus on robust thought processes rather than raw intelligence or information accumulation.

The book is structured in three sections covering individual rethinking, influencing others, and systemic change, with readers particularly appreciating the non-judgmental tone and effective use of infographics. Grant's central thesis—that in a rapidly changing world, the ability to rethink and unlearn matters more than simply thinking and learning—resonates strongly with readers seeking personal development. The book emphasizes that true expertise is marked by humility and open-mindedness rather than overconfidence, and that treating beliefs as provisional hypotheses rather than fixed truths enables continuous growth. While specific criticisms are limited in the available reviews, the book's practical approach to recognizing and overcoming cognitive biases appears to be its strongest appeal.

What readers loved

  • Highly accessible successor to complex behavioral psychology books like Thinking Fast and Slow
  • Provides practical framework for distinguishing between preacher, prosecutor, and politician mindsets versus scientist mindset
  • Emphasizes intellectual humility and the importance of knowing what you don't know
  • Non-judgmental and sensible writing style that doesn't talk down to readers
  • Excellent use of infographics and visual aids to illustrate concepts
  • Structured approach covering individual, interpersonal, and systemic levels of rethinking
  • Encourages detaching self-identity from specific beliefs to enable genuine growth

Common critiques

  • Some concepts about overconfidence and the Dunning-Kruger effect may feel familiar to readers of similar psychology books
  • Limited critical reviews available suggest potential selection bias in highly positive reception

Based on reviews from

  • Goodreads - Main Page
  • Goodreads - George Woodbury Review
  • Goodreads - Thomas Edmund Review
  • Goodreads - Nikita D'Souza Review
  • Goodreads - David Lindelof Review
Last updated May 18, 2026 Summary based on publicly available reviews. May not reflect every reader's experience.