This comes via Brian Cain and Dr. Rob Gilbert, but it's the first chapter of former St. Louis Cardinal Frank Bettger's book How I Raised Myself from Failure to Success in Selling. Short answer: enthusiasm. Being passive and unenthusiastic does not open doors for you. Being enthusiastic does.

10 minutes of me enthusiastically reading Bettger. 

If you want a professional, here's Cain. 

As always, I welcome all feedback... Thanks!!!