That is pretty good, especially because you have a concrete idea that has helped you. I would suggest not using a quote though, I think it would be better to put it in your own words. Here is mine:
There was only one Constantine. There was only one Thomas
Edison. There is only one Billy Graham. The impact made by each of these men is immeasurable. What if these men had decided to be lazy, to ignore their abilities and live an average life? The world would be a much different place today. Instead, these people chose to use their talents to achieve their potential. These men were the only people with their specific circumstances, and therefore no one else could have accomplished what they did. There is only one Blake Alderink. It is my responsibility to reach my full potential. This idea has been vital to my intellectual development up to this point, and will continue to be for the rest of my life. My personal convictions regarding potential have inspired me to strive to achieve all that I can. I have a desire to have a significant, positive impact on people; however, this desire alone is not what invigorates me. This desire stems from my belief that I am called to do just that. In the same way that much is required from whom much is given, I am responsible for making the most of what I have, whatever that may be. This responsibility, along with my desire, is my inspiration. I believe that the impact I have is directly related to achieving my potential. Therefore, if I do attain my potential, I can have the greatest impact on the world. The reason my responsibility to reach my potential has been so important to my growth intellectually is that I believe my intellect allows for me the most potential. I consider my mind to be one of my greatest assets. Logic and reasoning have always been essential in my life. Furthering my knowledge so that I can grow in wisdom is extremely important to me, as well. These intellectual inclinations have led me to realize where my potential lies, at least up to this point. For this reason, striving to recognize my potential has directly affected my intellectual growth. No one else can reach my potential. My potential is a height only I am tall enough to reach, and it just might happen to be worth reaching for.