It is the capacity to restart oneself over and over again. If we are talking about Sales, this is No. 1. You have to start from 0 to get to 1. And Marketing is somehow the City of Sales you have to be able to create. You won't be successful in it if you don't understand the ability to sell. Just learn it day by day! The quality has to be trustworthiness. If you can't be trusted you are a bad Salesperson and you'll decrease the image of salespersons.