There are certain things which are given as absolutely sinful in the Scripture, and these things we as Christians should not do…. But then everything else is spiritual. The painting of a picture, the work of a good shoemaker, the doctor, the lawyer – all these things are spiritual if they are done within the circle of what is taught in Scripture, looking to the Lord day to day for His help.
Thus everything is spiritual because the Lord made everything, and Christ dies to redeem everything. And though full restoration will not come until Christ returns, it is our calling, looking to Christ for help, to try to bring substantial restoration in every area of life….
To be spiritually minded is to realize that we must have the wisdom God gives in the Scriptures, and not think, as modern man thinks, that his own finite knowledge is a sufficient starting place. You can think about anything [i.e. about every area of life rather than only about a limited “spiritual” area] – as long as you live within the circle of Scripture; that is, by recognizing God’s existence and, as God gives you strength, rejecting what the Bible says is specifically sinful.
[When the Bible speaks of seeking the things which are above, it is simply saying that we should see] everything from the perspective of God’s existence and what is taught in Scripture, rather than seeing things as though man were autonomous; or seeing things as though life consisted only of physical life and death… [without taking into account] the totality of reality, which of course includes above all the existence of God….
Worldliness [on the other hand] is seeing anything in life from a materialistic perspective – that is, from a perspective which makes the material world the final reality, and in which man’s finite wisdom (rather than Scripture) is everything. In other words, worldliness is removing any area of life or culture from under the judgment of Scripture.
Francis Schaeffer(1912-84), Letter of Francis Schaeffer: Spiritual Reality in the Personal Christian Life, 168-69.