It is a fight from start to finish to be happy in God.
Maintaining joy in God takes 'work'; that is, it's a fight against every impulse for alien joys and every obstacle in the way to seeing and savoring Christ.
Fight for us, O God, that we not drift numb and blind and foolish into vain and empty excitements. Life is too short, too precious, too painful to waste on worldly bubbles that burst. Heaven is too great, hell is too horrible, eternity is too long that we should putter around on the porch of eternity.
Too many Christians are fighting graduate school sins with a grammar school knowledge of God.