A study done by leading psychologist Daniel Goleman of nearly 200 large, global companies revealed that emotional intelligence, especially at the highest level in the companies, is the sine qua non [an indispensable and essential action] for leadership2.
The components of emotional intelligence are self- awareness, self-regulation, motivation, empathy, and social skill.
(2) Daniel Golemen. Harvard Business Review: What Makes A Leader. Boston, MA, 1998-2001, pg. 1-3.