" The single most important factor in maximizing the excellence of a group’s product was the degree to which the members were able to create a state of internal harmony, which lets them take advantage of the full talent of their members. The overall performance of harmonious groups was helped by having a member who was particularly talented; groups with more friction were far less able to capitalize on having members of great ability. In groups where there are high levels of emotional and social static—whether it be from fear or anger, from rivalries or resentments—people cannot offer their best. But harmony allows a group to take maximum advantage of its most creative and talented members’ abilities. "

― Daniel Goleman , Emotional Intelligence: Why It Can Matter More Than IQ