When it comes to a challenge, someone in a fixed mindset might not even take on a challenge because there is a potential to fail. If they cannot perceive success, they don't engage. While with a growth mindset, you see a challenge is something to learn from whether you succeed or have to try, try again.
When someone with a fixed mindset it faced with an obstacle, he or she gives up. On the other hand, someone with a growth mindset figures out how to work around or through an obstacle. Nothing stands in his or her way. He or she will use any resources available to him or her to work through obstacles.
Someone with a fixed mindset doesn't value effort. Instead he or she sees having to put forth effort as a weakness. If it doesn't come easily, then it's not worth putting the effort into. He or she struggles to see how effort is worthwhile. Someone with a growth mindset sees effort as worthwhile. Through effort, we can learn and grow.
A person with a fixed mindset sees criticism as a negative thing. He or she might take criticism very personally and might be defensive. He or she might not be able to hear even constructive criticism. A person with a growth mindset appreciates criticism as an opportunity to grow and learn and improve.
With a fixed mindset, we might see others and feel threatened by them and what they have accomplished. We might list excuses for why that person was able to succeed, and sometimes attribute their success to luck. With a growth mindset, we can appreciate the work others have put into their successes and we can see others as inspiration. We can find motivation from seeing what others have been able to accomplish.
As a result...it can be sad for people with a fixed mindset because they cut themselves off from the opportunity to learn and grow and live up to their fullest potential. While people with a fixed mindset might still be very potential, they might not maximize that potential. On the other hand, people with a growth mindset have the opportunity to learn and grow and do most with what they have.