A life out of balance will spin passion right smack to the bottom of the proverbial empty bucket. The fact is passion doesn't survive on lack of sleep, lack of exercise, or lack of eating. It doesn't even do particularly well if you're logged on 18 out of 24 hours every day. Don't confuse passion with obsession. Obsession will kill passion.
Passion lives hand in hand with balance.
So if your attitude isn't passionate, look at the rest of your life for answers. You nurture passion by taking care of yourself. The one that separates the winners from the quitters. It goes like this. Quitting isn't a feeling.