The prompt for Day 15, the final day of Sar's 15 Day Challenge is: What's the best compliment you've ever received.
This answer has definitely evolved throughout my life.
Growing up - I always liked and appreciated being told that I was mature. Today, I enjoy being recognized as someone who is hard working and who catches on fast to processes and concepts at work.
But the best compliment I've ever received was while I was playing softball in college. Several times throughout my senior year, my teammate Wags' Dad told me, "I have so much fun watching you play."
I never asked why, or for any explanation - but it always made me feel good and was an affirmation that I was playing my hardest and best, and leaving it all out on the field.