Commitment, belief and positive attitude are all important if you're going to be a success, whether you're in sports, in business or, as in my case, anthropology.

This quote means that if you want to be successful in whatever endeavor you pursue, you must have a strong commitment to it, have a strong belief in yourself, and have a strong positive attitude towards it. This applies to sports, business, and even less mainstream things like anthropology. You need all three of these things if you want to reap success.