Commitment of the Trader

I read the following from Dr. Van K Tharp's article.

You will notice that at the top of the list I include "vision." One of the keys to real success in trading is commitment. Before I coach a trader, I look for commitment. Those who are not committed to do what it takes, usually commit financial suicide when they try to be full time traders. Now, I have no idea how to give people commitment. It's more like something they are born with—not something I can coach.