Being called "headstrong" usually isn't a compliment. It's the polite way to say that you're stubborn. Unwilling to change.

But when you take a deeper look at this idea of being headstrong you realize the brilliance of the terminology. Strong mind. Strong goals. Strong vision. Headstrong.

This is the story of Anthony Iannarino, who writes the most popular blog on sales on the planet, aptly called The Sales Blog. He's a partner in a multi-million dollar staffing agency, a worldwide business speaker, and author.

But he used to be a rockstar...