No matter how good you are at the sales game, a career in sales includes rejection. Lots of it. The key to not only surviving, but thriving, in such a difficult environment has more to do with you than the number of deals closed.
The more proactive and resourceful you are in sales, and the better your judgment calls and decision-making are when you’re dealing with an obstacle (such as remaining motivated while trying to close a deal), the greater the trust and confidence others (future clients, etc.) will have in you.
Motivation Comes From Within- Motivation is something you do for yourself rather than something that happens to you, as many have commonly believed.
http://ghinsberg.com/motivational-speaker/ It is a set of mental processes, and though it may not be easy, it is within your control.