"The indispensable first step to getting
the things you want out of life is this:
decide what you want."
- Ben Stein

The problem is knowing what you want or what is right to have a desire for. In running it's easy to set goals:
- Run a certain race;
- Run a set distance in a set time;
- Raise X amount of money;
- X amount of miles in training etc.

In a sense, historically, humans have had their goals related to running. It's only in the modern world that we have more "spare" time so we get confused and fill it with junk.

Please watch this video to see what humans were like when we were normal... Running was decided for us: Run or have no food! David Attenborough - BBC - Life of mammals

http://www.youtube.com/watch?v=826HMLoiE_o