In her influential book Mindset, pioneering psychologist Carol Dweck describes how the two different mindsets—which she calls fixed and growth—make a huge difference in our performance and personal happiness. Observe the difference: SCENARIO: After completing an assignment, your manager gives you a few suggestions for improvement. FIXED MINDSET: Ugh, I really messed that up. My manager must think I’m an idiot. GROWTH MINDSET: I’m thankful my manager gave me those tips. Now all my future assignments are going to go better. —