one who rules his own house well, having children in subjection with all reverence;

 Here in one phrase is the reason why the Pastoral Epistles were written; they were written to tell men how to behave within the Church. The word for to behave is anastrephesthai ( G390) ; it describes what we might call a man's walk and conversation. It describes his whole life and character; but it specially describes him in his relationships with other people. As it has been said, the word in itself lays it down that a church member's personal character must be excellent and that his personal relationships with other people should be a true fellowship. A church congregation is a body of people who are friends with God and friends with each other. Paul goes on to use four words which describe four great functions of the Church. 