The results were so striking that we repeated the study five times just to be sure, and each time roughly the same things happened. Intelligence praise, compared to effort (or "process") praise, put children into a fixed mindset. Instead of giving them confidence, it made them fragile, so much so that a brush with difficulty erased their confidence, their enjoyment, and their good performance, and made them ashamed of their work. This can hardly be the self-esteem that parents and educators have been aiming for. 

Next, we found that students with the two mindsets had radically different beliefs about effort. Those with a growth mindset had a very straightforward (and correct) idea of effort — the idea that the harder you work, the more your ability will grow and that even geniuses have had to work hard for their accomplishments. In contrast, the students with the fixed mindset believed that if you worked hard it meant that you didn't have ability, and that things would just come naturally to you if you did. This means that every time something is hard for them and requires effort, it's both a threat and a bind. If they work hard at it that means that they aren't good at it, but if they don't work hard they won't do well. Clearly, since just about every worthwhile pursuit involves effort over a long period of time, this is a potentially crippling belief, not only in school but also in life.