In "Think Again," Adam Grant explores the concept of identity foreclosure and its impact on career choices. He argues that premature commitment to a career path—often influenced by societal pressures and personal convictions—can lead to deep regrets later in life. Many individuals become overly certain about their career plans, leading them to overlook alternative paths and the necessary rethinking that accompanies personal and professional growth. Grant emphasizes the importance of viewing identity in terms of values rather than rigid opinions. By doing so, individuals can maintain mental flexibility and be open to reevaluating their paths as their interests and the job market evolve. The book encourages a scientific approach to career decisions, advocating for testing assumptions and exploring various selves before making a long-term commitment.