A short, beautiful section.  Our joy and God's joy are intended to be one in the same.  That's a concept we seem to have all but given up on.  In our insistence that we know best, that we deserve whatever it is we think will make us happy, in our determination to remain rulers of our relativistic universes, we insist that what we decide will make us happy must be what will make God happy. 

And this is true, if what we choose to make ourselves happy with is in line with our design according to God.  God doesn't contradict himself.  Ever.  So if God says, 'sex outside of marriage is not a good thing', then we can be guaranteed that just because we happen to enjoy sex a lot as a single person, it isn't going to ultimately lead us to happiness.  If God says 'don't steal', then we can bet that cheating on our taxes, or shoplifting, or racking up massive credit card debt and then trying to claim bankruptcy really isn't going to make us happy.

That's the crucial issue here.  Our joy is God's joy.  But we only find joy through following the guidelines that God has provided for us.  Regardless of how 'unjoyful' they may appear at first glance.  Most people just assume that they could never be happy living by God's rules.  The sad thing is, most people won't ever be happy unless they do.