What's the Main Thing?

Haven't you ever heard of people say, "Keep the main thing the main thing"? I guess we all get to decide what the main thing is. The quote most likely is a moral or value driven statement. And maybe for some the 'main thing' changes from day to day. The main thing could be God, or family or Love...
Today the main thing for me is to breathe. No, seriously...I can't breathe. Allerigies are kicking my butt and I'm unable to concentrate on anything but trying to get a breath. The older I get the worse the allergies get...and today I lost. I couldn't work, plan or eat because of the lack of breath. I feel defeated...a little lost in having to concentrate on breathing.
It makes me think about how I often forget to breathe daily. We get up, get ready for the day, grab a bite to eat, drive to work, assess our day and then bam! we're off on a meeting, task driven day. When do we breathe and reasses the main thing? It's a trap we all fall into. No one is immune! Only now, when I'm forced to think about it do I stop to breathe. Help us all, Lord, to remember the importance of your breathe in our life.