Source
Mindset: The New Psychology of Success
Carol S. Dweck's book, published in 2006, on the difference between a 'fixed' mindset, which sees ability as set, and a 'growth' mindset, which sees it as something that can be developed.
References
Quotes (1)
“People with a growth mindset believe their abilities can be developed through effort and learning.”
— Carol S. Dweck, Mindset (2006): summary of the idea via Wikipedia (paraphrase, not a direct quote)Watch on YouTube: The power of believing that you can improve | Carol Dweck ↗Carol Dweck discusses this idea