Excellence is an art won by training and habituation. We do not act rightly because we have virtue or excellence, but we rather have those because we have acted rightly. We are what we repeatedly do. Excellence, then, is not an act but a habit.
If a man is called to be a streetsweeper, he should sweep streets even as Michelangelo painted, or Beethoven composed music, or Shakespeare wrote poetry. He should sweep streets so well that all the hosts of heaven and earth will pause to say, here lived a great streetsweeper who did his job well.
It is the mark of an instructed mind to rest satisfied with the degree of precision which the nature of the subject admits and not to seek exactness when only an approximation of the truth is possible.
It's enough for you to do it once for a few men to remember you. But if you do it year after year, then many people remember you and they tell it to their children, and their children and grandchildren remember and, if it concerns books, they can read them. And if it's good enough, it will last as long as there are human beings.
A racehorse that consistently runs just a second faster than another horse is worth millions of dollars more. Be willing to give that extra effort that separates the winner from the one in second place.