“If you’re not angry, you’re either a stone or too sick to be angry.”

Dr. Maya Angelou

1928 – 2014

Great leaders do not ignore their anger, nor do they allow themselves to get consumed by it. Instead, they channel the emotion into energy, commitment, sacrifice, and purpose. They use it to step up their game. And they infuse people around them with this form of constructive anger so they, too, can be infused with energy commitment, sacrifice and purpose. In the words of King in Freedomways magazine in 1968, “The supreme task [of a leader] is to organize and unite people so that their anger becomes a transforming force.”
http://www.inc.com/hitendra-wadhwa/great-leadership-how-martin-luther-king-jr-wrestled-with-anger.html