As long as my heart's still in it, I'll keep going. If the passion's there, why stop?... There'll likely be a point of diminishing returns, a point where my strength will begin to wane. Until then, I'll just keep plodding onward, putting one foot in front of the other to the best of my ability. Smiling the entire time.

Running back-to-back races requires a certain tactical prudence. Going too hard in any one race might jeopardize your performance in another. Maintaining proper hydration and caloric equilibrium also becomes increasingly critical.

Never, however, do I take shortcuts. There is not path of least resistance in my training. What I do equates to hard manual labor, disciplined grunt work. Once you permit yourself to compromise, you fail yourself. You might be able to fool some people, but you can never fool yourself. Your toughest critic is the one you face every morning in the mirror.

Most dreams die a slow death. They're conceived in a moment of passion, with the prospect of endless possibility, but often languish and are not pursued with the same heartfelt intensity as when first born. Slowly, subtly, a dream becomes elusive and ephemeral. People who've lost their own dreams become pessimists and cynics. They feel like the time and devotion spent on chasing their dreams were wasted. The emotional scars last forever.

Toeing the starting line of a marathon, regardless of the language you speak, the God you worship or the color of your skin, we all stand as equal. Perhaps the world would be a better place if more people ran.

If you just go out there and run 100 miles, it breaks down a lot of barriers in terms of self-imposed limitations.