Kidding aside, we attorneys deal with losses and defeats more than most because of the adversarial nature of our profession. Lawyers are pitted against one another in trial, during deals, in hearings, during discovery disputes, in administrative proceedings, during divorce proceedings, etc. Ours is a profession marked by daily wins, and daily losses. In a profession where losing is so prevalent, it's appropriate to sit back and reflect on the notion of losing. Though my Irish heritage, Catholic upbringing, and Notre Dame undergraduate experience pain me to say so, Knute Rocken got it wrong when he said a good loser is a failure.
Good losers are winners for a variety of reasons.
For example, they're winners because they tend not to get mired in self-defeating attitudes. It's hard to generalize what it takes to be a good loser. Every person is different. Some people are naturally better losers than others. Coming to grips with that fact enables us to better deal with those defeats and disappointments that just shouldn't be.