A Gentleman is Knowledgeable of the World
He has an informed philosophy of Mankind that makes his reactions humane.
A Gentleman is not a dictionary of trivia, filled with disconnected facts. All that a Gentleman takes in from the world around him must be processed. And a Gentleman is processing far more than to merely decide if issues are true or false. He is analyzing what he discovers to be true in the elements of politics, gender, family, and other varied events created by mankind (like sport or the arts or money) that is the range of what is a civilized society. To be informed he has paid attention to this wide variety of phenomena and created a basic, perhaps simple systematic that prepares him for the "new" events that enter his life. Each "new" event will either be explicable by or corrective to his understanding. This life philosophy is a ground for a Gentleman's behavior and, since that behavior is to be humane, these thoughts ought easily be drawn upon to defend his actions. In this way he can act with his surrounding company perceiving a pattern to his deeds and finding them justified should they question him on it. He becomes an grounding asset to the moment. Since everything happens (everyone knows) for a reason, he is the one who, perhaps, knows which reason. This keeps him from being merely a Pharisee obedient to the laws of a given society and makes him a Freeman obedient to his understanding. It requires an astute appraisal and logical understanding of cause and effect with a education in the nature of man.