The natural man and the spiritual man. It describes the materialist , who lives as if there were nothing beyond this physical life. This is the kind of life common to all animals. The natural man is unregenerate man, unsaved man. God is not displeased when you have to eat and sleep and work.
Spiritual things seem foolishness to the natural man .
The natural man doesn t want the things of God because he regards them as foolishness. It would be wrong to expect the natural man to see and value spiritual things, just as it would be wrong to expect a corpse to see the material world. The natural man is unsaved. Too many Christians still think like natural men, refusing to spiritually discern things.