Heart

Just knowing what to do is half the battle.  We must train our hearts on how to communicate and how to interact with others.  We must learn how to get along and work effectively with others.  We must seek to understand each other.  We must learn how to solve problems humanely.  We must learn how to respect each other.  We all have to live together; so let us learn to live in peace. 

Franklin Covey

The Myers and Briggs Foundation

John Maxwell

Jocko Willink

David Goggins

Daniel Goleman

Kevin Samuels on YouTube