One of the best sales people I know once told me, "They either convince you they don't need your product or you convince them they can't live without it." I think about that every time I get rejected to make sure I never get convinced :-)
"It takes brass balls to sell real estate."
Then he turns around and he is holding brass balls. A-B-C is the best pitch ever in a movie, after greed is good of course.
If you want a great example of how to deal with rejection, come to Haight Ashbury and watch the homeless people ask for change. Sometimes if they have a good enough pitch, I'll give them a dollar. There was one guy giving "bad advice" and he told me to give him my credit card and to have unprotected sex with an intravenous drug user.
I gave him a dollar.