Read Proverbs 18:2  Here we go talking about a fool again.  Our verse says that the fool has no understanding.  That doesn't mean that a fool doesn't know anything - he just doesn't have understanding with what he knows.  He knows things he just doesn't know what they mean.  It's like the fool knows how to add and subtract money, but he doesn't understand how to save his money.  He just wastes it and has nothing, even though he knows he will need money to pay for his food tomorrow.  He knows but he doesn't understand.  But our verse goes on to say that the fool does know one thing: he knows how to have fun and how to be selfish.  Our verse says that the fool tries to discover his heart. That means that what he wants to do in his heart, that is what he does.  He gives in to his feelings.  He never tells himself no.  Do you know people like that?  Whatever game they want to play, they play.  And everyone else around them has to play their game with them.  Whatever video they want to play, they do.  They don't let other people play.  They are selfish.  They do not tell themselves no.  Every once in a while we need to tell ourselves no.  It is good practice.  We need to listen to others.  We need to let others go first.  We need to let others be in charge.  It isn't that we don't want to be in charge; it's that we should not want to let ourselves to be in charge of us.  We should be in charge of ourselves.  Don't be like the fool in our verse and let our hearts tell us what to do.  Don't just give in to your feelings.  Do the right thing.