Control leads to compliance; autonomy leads to engagement.

We have this myth that extroverts are better salespeople. As a result, extroverts are more likely to enter sales; extroverts are more likely to get promoted in sales jobs. But if you look at the correlation between extroversion and actual sales performance - that is, how many times the cash register actually rings - the correlation's almost zero.

Newtonian physics runs into problems at the subatomic level. Down there--in the land of hadrons, quarks, and Schrödinger's cat--things gent freaky. The cool rationality of Isaac Newton gives way to the bizarre unpredictability of Lewis Carroll.

Especially for fostering creative, conceptual work, the best way to use money as a motivator is to take the issue of money off the table so people concentrate on the work.

The ability to take another perspective has become one of the keys to both sales and non-sales selling. And the social science research on perspective-taking yields some important lessons for all of us.

I think the more important task for a young person than developing a personal brand is figuring out what she's great at, what she loves to do, and how she can use that to leave an imprint in the world. Those are tough questions, but essential ones. Answer those - and the personal brand follows.

But in the end, mastery involves working and working and showing little improvement, perhaps with a few moments of flow pulling you along, then making a little progress, and then working and working on that new, slightly higher plateau again. It's grueling, to be sure. But that's not the problem; that's the solution.