Too fast, Too furious: Good?

Fast may not be a good thing in a marathon if:

1) You are not sure of what you are running for.
2) You do not have what it takes at the current pace.
3) You do not have the stamina to sustain the current pace.
4) You do not have the ability to run at a faster pace if needed.
5) You are running the wrong route.
6) You do not have the potential for long distance running.

Blooper: Thank you for reminding me that fast may not be a good thing.