This quote has a very deep meaning. It was said by Don Quixote to Sancho when they were on their way on an adventure, and Sancho points out that they are walking on a normal road. As the reader reads the play, they would understand that there is no adventure and there is no actual Don Quixote, these are made-up characters and made-up actions and adventures from an old insane man, Alonso Quijana. However, back to the q uote “…like beauty, my friend, ‘tis in the eye of the beholder” (Cervantes 21). The meaning of this quote is that you can see whatever you want to see, if Sancho wanted to see "the road to EL Tobos where you can buy chickens cheap" as beautiful as Don Quixote, he could, however, he chose not to. Your eyes control how you see the world. Whatever your eyes see, it is what's best for you, what you should have seen. A person's vision can be different from another's, as we can see in the play Don Quixote sees something whereas Sancho sees another thing...
Angela Lee Duckworth talks about the common characteristic in people who stay at their jobs, and sports, win in competitions, do not drop out, etc. After very long research and cooperation with companies, she learned that most people who end up staying in their place and not giving up are people with grit. What is grit? Grit can be thought of as the strength and power of a person to not give up, and to fight for the long run. Determination. It is to be determined to win, to reach your goal. And to have that does not mean to have a love for whatever you are doing, but to be resilient and stand back up when you fail, in addition to not giving up.