What it all comes down to is that a mindset is an interpretative process that tells us what is going on around us. In the fixed mindset, that process is scored by an internal monologue of constant judging and evaluation, using every piece of information as evidence either for or against such assessments as whether you’re a good person, whether your partner is selfish, or whether you are better than the person next to you. In a growth mindset, on the other hand, the internal monologue is not one of judgment but one of voracious appetite for learning, constantly seeking out the kind of input that you can metabolize into learning and constructive action.
In the rest of Mindset: The New Psychology of Success, Dweck goes on to explore how these fundamental mindsets form, what their defining characteristics are in different contexts of life, and how we can rewire our cognitive habits to adopt the much more fruitful and nourishing growth mindset.