"We distilled the analysis into two key traits: wisdom, the courage to do what needs to be done, even when it is difficult; and compassion, the care and empathy shown toward others, combined with the intention to support and help. Both traits are important, but when they are combined, there is an exponentially higher impact on important metrics," three of the researchers behind the study explain on HBR.
https://www.inc.com/jessica-stillman/leadership-trait-study-potential-project.html