Fat and happy

This is not so much about being overweight and in a good mood but instead about contenting one self with the mediocre or easy, content with the pursuit and enjoyment of comfort.
I'm sure you are at least familiar with the evangelistic technique of going door to door.  This is seen often, even stereotypically, in the Mormons and Jehovahs Witnesses, but there are Baptists and some others that use this as well. Typically, one canvasses a neighborhood, systematically going door to door,  trying to preach the gospel to whomever will listen.  My thought here is not so much a critique of this methodology (though there is much here to critique), my thought has more to do with the listener.  If the guy who answers the door is not interested or is "fat and happy", he simply will not listen.  One may as well be selling freezers to an Eskimo. You are offering something he sees no use for.
This is all about perception, self perception and standards.  When we present the gospel to someone, we are typically speaking from our interpretation of reality, not that of our listener. And most likely, some very foundational, even presuppositional, items will differ between us. And until those items are addressed,  our words will fall on deaf ears.
If someone is of the opinion that this life is all there is, spending ones times praying and studying the Bible really makes no sense.  If someone is basically content and/or limited to the temporal,  speaking of eternity is nonsense.
A really horrible, but technically accurate metaphor works here.  To go into battle with the expectation to win,  one must know ones enemy.  The general who knows his combatant inside and out will have a far better chance of defeating him. Understanding our neighbor, and even better, understanding and loving our neighbor, will put us in a position where we can speak intelligently and effectively with him. To know his needs (personally his) is to know his cure.