"Don't let one bad thing ruin the rest of your day. Try and make it better."
I came up with it after a rather poor performance on the diamond discouraged me so much that I didn't want to go to a tryout for an AAU team I had later in the day. After much persuasion from my parents, I went. I am still playing for that team a year later, and the memories I've made with my teammates will last me a lifetime.