Being driven solely by fear is a terrible feeling. Being driven by anger is equally bad.
It is vitally important to have an understanding of both sides of the equation. To be driven only by fear to press forward. To be driven by only by anger to accomplish a goal.
It is also just as important to understand there is a completely other side. To be the one to create the fear, to be the one to cause the anger that serves as the final motivation to force another to bend to your will.