I wasn't a very good salesman and I wasn't successful in that business, but I've always been a student of motivation. My grandfather, Herb Schafer (whom I called Pob,) inspired me - despite his suffering from agoraphobia.
Here is a wonderfully motivational speech from the 2014 commencement of the graduating class of the University of Texas by Navy Seal Admiral William H. McRaven. I recommend that you watch it every day . . .