Pretty inspiring bit from John “The Penguin” Bingham.
If you run, you are a runner. It doesn’t matter how fast or how far. It doesn’t matter if today is your first day or if you’ve been running for twenty years. There is no test to pass, no license to earn, no membership card to get. You just run.
( Source )
Another article on the topic by John.
I AM A RUNNER because my runs have names. I do tempo runs and threshold runs and fartlek runs. I do long, slow runs and track workouts. My runs are defined, even if my abs are not.
I AM A RUNNER because my shoes are training equipment, not a fashion statement. The best shoe for me is the one that makes me a better runner. I choose the shoe that goes with my running mechanics, not my running outfit.
I AM A RUNNER because …