He is Jealous.

"He is a holy God; he is a jealous God." Joshua 24:19

The Lord is jealous for us and our affection.  We sing it over and over, that "He is jealous for me"... but do we really understand what that means?  It means that He is eager to protect what is precious to Him: His creation.  It is not enough to just give Him our Sunday mornings.  He will not stand to be a task or an afterthought.  He wants exclusive devotion from us.  He wants our everything.  Nothing should come before Him in our minds or hearts.  He desires and deserves what is rightfully His.