1Co 2:14 But the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know them, because they are spiritually discerned.
I hate to be harsh,but the world is retarded,they are spiritually retarded.
Like someone in the physical realm that cannot comprehend to physical truths,and some people will say that person is retarded,the people that do not receive the things of the Spirit of God cannot comprehend to the spiritual truths.
I do not like to use the word retarded,but to illustrate the point,the world is retarded,they are spiritually retarded.