Do you think it is possible to increase your intellectual ability? For decades I have studied the power of this belief—a belief that intellectual abilities can be developed—to become reality, and I have watched as the concept of maintaining a “growth mindset” has taken root in education and parenting circles. My colleagues and I have now shown repeatedly that students who believe their intelligence can grow tend to learn more, acquire deeper knowledge and do better—especially in hard subjects and in negotiating difficult school transitions—compared with equally able students who believe their intelligence is a fixed trait.