How could God invite you to heaven, where the most exciting thing to do all day is gaze upon His glorious face, if you're not in heaven right here on earth when you're alone with Him? Do you think that after you die, suddenly you'll be in heaven and "presto!" all at once you're not going to like worldly things anymore? All of a sudden you'll love more than anything else just to hang out with God, when you couldn't stand being alone with Him even 20 minutes a day?