On ESPN's Mike & Mike in the Morning, Mark Schlereth said that if you aren't getting your butt whipped some of the time, you aren't competing at a high enough level.
He was talking about baseball, but this is true of any sport. How athletes deal with losing has a lot to do with how successful they ultimately are.
CHURCH!! I couldn't agree more! As a coach and educator, it is plain as day to see the kids who don't know what its like to lose and when they do its a terrible sight!