In "Think Again," reflection is a critical component of the rethinking process. Adam Grant posits that rethinking liberates individuals from outdated beliefs and opens them up to new possibilities, essentially allowing them to lead a more fulfilling life. He encourages readers to treat their opinions as hypotheses and to engage in a cycle of questioning and testing their beliefs. This involves reflecting on one's values rather than just opinions, fostering a mindset oriented towards curiosity and mental flexibility. Reflection also serves as a way to evaluate decisions and beliefs, providing a robust framework for personal and professional growth. Overall, Grant emphasizes that even if rethinking does not change one’s mind, the process itself enhances thoughtful consideration and understanding.