It is a deadly direction spiritually. Paul wrote that those who set their minds on earthly things are on the road to destruction (Philippians 3:19). He was talking about gratifying the senses and getting what we can out of life. If we are rich in earthly things but poor in spiritual things, our lives are going nowhere. There is no place else to go after life than eternity. We do not get there minding earthly things. That is a spiritual realm.

Eternal life calls for the transformation of our physical, earthy bodies into a glorious spiritual body that never ages, gets weary or ill and has almost no limits (Philippians 3:21). Paul wrote that our citizenship is in heaven. Therefore we ought to be mindful of the things of our "country." Those things are spiritual. We can and must live in an earthly body with earthly things, but we can focus on the spiritual. In fact, we must.