"Aristotle's" Key to Excellence - The Power of Diligence

According to a popular motivational meme, Aristotle says the key to excellence lies in the power of diligence and habits. Is it true?
If he's right, then Nike's marketing has left us feeling shortchanged in their advice to "Just Do It!"
We explore the impact of diligence or self-discipline on a man in the five arenas of life, and then look at a foolish concept from our culture that may sabotage your ability to pursue excellence.