I think it's important to keep mantras fresh (sometimes the same verse can get stale). That being said, I love this powerful statement: 'Define yourself.' I rehearsed it a million times during the 2005 Chicago Marathon [her first win].
I felt my throat start to close up, and I didn't think I was getting enough oxygen. I was scared, and I thought about quitting. But you don't want to quit when you've trained so hard and long for one race.