Do you think it is possible to increase your intellectual ability? For decades I have studied the power of this belief to become reality and watched as the concept of maintaining a “growth mind-set” has taken root in education and parenting circles. My colleagues and I have now shown repeatedly that students who believe their intelligence can grow 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.