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

by Adam M. Grant

When people reflect on what it takes to be mentally fit, the first idea that comes to mind is usually intelligence. The smarter you are, the more complex the problems you can solve—and the faster you can solve them. Intelligence is traditionally viewed as the ability to think and learn. Yet in a turbulent world, there’s another set of cognitive skills that might matter more: the ability to rethink and unlearn.

Part of the problem is cognitive laziness. Some psychologists point out that we’re mental misers: we often prefer the ease of hanging on to old views over the difficulty of grappling with new ones. Yet there are also deeper forces behind our resistance to rethinking. Questioning ourselves makes the world more unpredictable. It requires us to admit that the facts may have changed, that what was once right may now be wrong. Reconsidering something we believe deeply can threaten our identities, making it feel as if we’re losing a part of ourselves.

This book is an invitation to let go of knowledge and opinions that are no longer serving you well, and to anchor your sense of self in flexibility rather than consistency. If you can master the art of rethinking, I believe you’ll be better positioned for success at work and happiness in life. Thinking again can help you generate new solutions to old problems and revisit old solutions to new problems. It’s a path to learning more from the people around you and living with fewer regrets. A hallmark of wisdom is knowing when it’s time to abandon some of your most treasured tools—and some of the most cherished parts of your identity.

Thinking like a scientist involves more than just reacting with an open mind. It means being actively open-minded. It requires searching for reasons why we might be wrong—not for reasons why we must be right—and revising our views based on what we learn.

What set great presidents apart was their intellectual curiosity and openness. They read widely and were as eager to learn about developments in biology, philosophy, architecture, and music as in domestic and foreign affairs. They were interested in hearing new views and revising their old ones. They saw many of their policies as experiments to run, not points to score. Although they might have been politicians by profession, they often solved problems like scientists.

Confident humility doesn’t just open our minds to rethinking—it improves the quality of our rethinking. In college and graduate school, students who are willing to revise their beliefs get higher grades than their peers. In high school, students who admit when they don’t know something are rated by teachers as learning more effectively and by peers as contributing more to their teams. At the end of the academic year, they have significantly higher math grades than their more self-assured peers. Instead of just assuming they’ve mastered the material, they quiz themselves to test their understanding.

Plenty of evidence suggests that confidence is just as often the result of progress as the cause of it. We don’t have to wait for our confidence to rise to achieve challenging goals. We can build it through achieving challenging goals. “I have come to welcome impostor syndrome as a good thing: it’s fuel to do more, try more,” Halla says. “I’ve learned to use it to my advantage. I actually thrive on the growth that comes from the self-doubt.”

Psychologists have long found that the person most likely to persuade you to change your mind is you. You get to pick the reasons you find most compelling, and you come away with a real sense of ownership over them.

In a heated argument, you can always stop and ask, “What evidence would change your mind?” If the answer is “nothing,” then there’s no point in continuing the debate. You can lead a horse to water, but you can’t make it think.

By asking questions rather than thinking for the audience, we invite them to join us as a partner and think for themselves. If we approach an argument as a war, there will be winners and losers. If we see it more as a dance, we can begin to choreograph a way forward. By considering the strongest version of an opponent’s perspective and limiting our responses to our few best steps, we have a better chance of finding a rhythm.

As we work toward systemic change, Daryl urges us not to overlook the power of conversation. When we choose not to engage with people because of their stereotypes or prejudice, we give up on opening their minds. “We are living in space-age times, yet there are still so many of us thinking with stone-age minds,” he reflects. “Our ideology needs to catch up to our technology.” He estimates that he has helped upwards of two hundred white supremacists rethink their beliefs and leave the KKK and other neo-Nazi groups. Many of them have gone on to educate their families and friends. Daryl is quick to point out that he hasn’t directly persuaded these men to change their minds. “I didn’t convert anybody,” he says. “I gave them reason to think about their direction in life, and they thought about it, and thought, ‘I need a better path, and this is the way to go.’ ”

This practice can extend far beyond the classroom. As we approach any life transition—whether it’s a first job, a second marriage, or a third child—we can pause to ask people what they wish they’d known before they went through that experience. Once we’re on the other side of it, we can share what we ourselves should have rethought.

It’s a mistake to follow traditions because the status quo is familiar. We’re better off questioning whether past routines are serving us well in the present and guiding us toward a better future.

Recently at dinner, our kids decided to go around the table to ask what everyone wanted to be when they grew up. I told them they didn’t need to choose one career; the average person ends up holding a dozen different jobs. They didn’t have to be one thing; they could do many things. They started brainstorming about all the things they love to do. Their lists ended up including designing Lego sets, studying space, creative writing, architecture, interior design, teaching gymnastics, photography, coaching soccer, and being a fitness YouTuber.

A successful relationship requires rethinking. Psychologists find that doing an annual relationship health checkup improves satisfaction in married couples. Sometimes being considerate means reconsidering something as simple as our habits. Learning not to be fashionably late to everything. Retiring that wardrobe of ratty conference T-shirts. Rolling over to snore in the other direction. At other times being supportive means opening our minds to bigger life changes—moving to a different country, a different community, or a different job to support our partner’s priorities. In my student’s case, it meant rethinking who his fiancée would be, but also staying open to who she might become. She eventually switched jobs and became passionate about both her work and a personal cause of fighting educational inequity. When we’re willing to update our ideas of who our partners are, it can give them freedom to evolve and our relationships room to grow. Whether we do checkups with our partners, our parents, or our mentors, it’s worth pausing once or twice a year to reflect on how our aspirations have changed. As we identify past images of our lives that are no longer relevant to our future, we can start to rethink our plans. That can set us up for happiness—as long as we’re not too fixated on finding it.

There’s a lot a vacation can do: help you unwind, see some different-looking squirrels, but it cannot fix deeper issues, like how you behave in group settings. We can take you on a hike. We cannot turn you into someone who likes hiking. Remember, you’re still gonna be you on vacation. If you are sad where you are, and then you get on a plane to Italy, the you in Italy will be the same sad you from before, just in a new place.

As valuable as rethinking is, we don’t do it enough—whether we’re grappling with the pivotal decisions of our lives or the great quandaries of our time. Complex

problems like pandemics, climate change, and political polarization call on us to stay mentally flexible. In the face of any number of unknown and evolving threats, humility, doubt, and curiosity are vital to discovery. Bold, persistent experimentation might be our best tool for rethinking.

1. Think like a scientist. When you start forming an opinion, resist the temptation to preach, prosecute, or politick. Treat your emerging view as a hunch or a hypothesis and test it with data. Like the entrepreneurs who learned to approach their business strategies as experiments, you’ll maintain the agility to pivot. For a free assessment of your habits of thinking like a preacher, prosecutor, politician, and scientist, visit www.adamgrant.net/quiz.

2. Define your identity in terms of values, not opinions. It’s easier to avoid getting stuck to your past beliefs if you don’t become attached to them as part of your present self-concept. See yourself as someone who values curiosity, learning, mental flexibility, and searching for knowledge. As you form opinions, keep a list of factors that would change your mind.

3. Seek out information that goes against your views. You can fight confirmation bias, burst filter bubbles, and escape echo chambers by actively engaging with ideas that challenge your assumptions. An easy place to start is to follow people who...

6. Embrace the joy of being wrong. When you find out you’ve made a mistake, take it as a sign that you’ve just discovered something new. Don’t be afraid to laugh at yourself. It helps you focus less on proving yourself—and more on improving yourself.

7. Learn something new from each person you meet. Everyone knows more than you about something. Ask people what they’ve been rethinking lately, or start a conversation about times you’ve changed your mind in the past year.

8. Build a challenge network, not just a support network. It’s helpful to have cheerleaders encouraging you, but you also need critics to challenge you. Who are your most thoughtful critics? Once you’ve identified them, invite them to question your thinking. To make sure they know you’re open to dissenting views, tell them why you respect their pushback—and where they usually add the most value.

11. Question how rather than why. When people describe why they hold extreme views, they often intensify their commitment and double down. When they try to explain how they would make their views a reality, they often realize the limits of their understanding and start to temper some of their opinions.

14. Acknowledge common ground. A debate is like a dance, not a war. Admitting points of convergence doesn’t make you weaker—it shows that you’re willing to negotiate about what’s true, and it motivates the other side to consider your point of view.

15. Remember that less is often more. If you pile on too many different reasons to support your case, it can make your audiences defensive—and cause them to reject your entire argument based on its least compelling points. Instead of diluting your argument, lead with a few of your strongest points.

18. Complexify contentious topics. There are more than two sides to every story. Instead of treating polarizing issues like two sides of a coin, look at them through the many lenses of a prism. Seeing the shades of gray can make us more open.

21. Have a weekly myth-busting discussion at dinner. It’s easier to debunk false beliefs at an early age, and it’s a great way to teach kids to become comfortable with rethinking. Pick a different topic each week—one day it might be dinosaurs, the next it could be outer space—and rotate responsibility around the family for bringing a myth for discussion.

22. Invite kids to do multiple drafts and seek feedback from others. Creating different versions of a drawing or a story can encourage kids to learn the value of revising their ideas. Getting input from others can also help them to continue evolving their standards. They might learn to embrace confusion—and to stop expecting perfection on the first try.

23. Stop asking kids what they want to be when they grow up. They don’t have to define themselves in terms of a career. A single identity can close the door to alternatives. Instead of trying to narrow their options, help them broaden their possi...

27. Throw out the ten-year plan. What interested you last year might bore you this year—and what confused you yesterday might become exciting tomorrow. Passions are developed, not just discovered. Planning just one step ahead can keep you open to rethinking.

29. Schedule a life checkup. It’s easy to get caught in escalation of commitment to an unfulfilling path. Just as you schedule health checkups with your doctor, it’s worth having a life checkup on your calendar once or twice a year. It’s a way to assess how much you’re learning, how your beliefs and goals are evolving, and whether your next steps warrant some rethinking.

30. Make time to think again. When I looked at my calendar, I noticed that it was mostly full of doing. I set a goal of spending an hour a day thinking and learning. Now I’ve decided to go further: I’m scheduling a weekly time for rethinking and unlearning. I reach out to my challenge network and ask what ideas and opinions they think I should be reconsidering. Recently, my wife, Allison, told me that I need to rethink the way I pronounce the word mayonnaise.