Many of us Christians at some time or another are gulity of this - getting our priorities wrong. We easily forget that man has a threefold nature, spirit, soul(mind) and body. The spirit is the part that God interacts with and this is the part (with the soul) that goes on forever with him when we move on to glory. And yet we spend too much time on the "flesh" part and lose sight of what is eternal.
In the marketplace, I find myself losing focus of this truth sometimes and depserately need to remind myself that I'm just a passing thru. However, having said that, I try to be blessing to others so I avoid being "so heavenly minded that I become no earthly use" for the Father's Glory.
The plumbline that keeps us in check would be total and complete obedience to God's Word and this is only possible if we feed on His Word daily, if we let "our light so shine to bring Glory to Him".