An eagle's egg was placed in the nest of a prairie chicken. The egg hatched and the little eagle grew up thinking it was a prairie chicken. The eagle did what the prairie chickens did. It scratched in the dirt for seeds. It clucked and cackled. It never flew more than a few feet because that is what the prairie chickens did. One day he saw an eagle flying gracefully and majestically in the open sky. He asked the prairie chickens: "What is that beautiful bird?" The chickens replied, "That is an eagle. He is an outstanding bird, but you cannot fly like him because you are just a prairie chicken." So the eagle never gave it a second thought, believing that to be the truth. He lived the life of and died a prairie chicken, depriving himself of his heritage because of his lack of vision. What a waste! He was born to win, but was conditioned to lose.
The same thing is true of most people. The unfortunate part of life is as Oliver Wendall Holmes said, "Most people go to their graves, with music still in them." We don't achieve excellence because of our own lack of vision