Matthew Henry : Thus, the natural man, the man destitute of the Spirit of God
John Gill : an unregenerate man
Adam Clarke : the man who is in a state of naturem without the regenerating grace of God
Barnes Notes : It refers to unregenerate people
Robertson's Word Pictures : A natural man, an unregenerate man
Wesley's Explanatory Notes : But the natural man --That is, every man who hath not the Spirit
Peter Pett's Commentary on the Bible : the man without the Spirit, man as he is without God
Thomas D.D. Constable's Expository Notes of the Bible : The natural man is any person who does not possess the Holy Spirit, namely, unbelievers.
John Piper : The unspiritual man is the natural man, the man who is merely human, who is not indwelt by the Holy Spirit.
I listened to Dr. Michael Barrett last night on this passage : the unconverted man dead in trespasses and sins.
Do I care? These are men's ideas. That is not what the context says.
Neither does the verse require that meaning.
Birds of a feather flock together.
How many of the above are Calvinists?
Never mind, it really doesn't matter.
The point is this: It may describe an unsaved man. But chapter three makes clear that the Corinthians were acting just like the person described in 2:14--whether unsaved or not. If the person in 2:14 is unsaved, the person in 1Cor.3:1-5 is acting just like him, and therefore is carnal.
We are in the world, but that does not give us license to act according to the world. That is what the Corinthians were doing.
1Co 3:1 And I, brethren, could not speak unto you as unto spiritual, but as unto carnal, even as unto babes in Christ.
Brethren--brothers in Christ: Christians.
"I could not speak unto you as unto spiritual." They were Christians, but they were not spiritual.
"But as unto carnal." They were Christians and carnal at the same time--Carnal Christians. Why?
--One of the reasons: "babes in Christ"--that is what Paul calls them. They were immature spiritually. They had not grown.
1Co 3:2 I have fed you with milk, and not with meat: for hitherto ye were not able to bear it, neither yet now are ye able.
--They are carnal because they are not able to be fed with meat. After 1 1/2 years Paul still has feed them milk. What an atrocity! They should be ready for meat, but because of their carnality they are not ready for the meat of God's Word.
1Co 3:3 For ye are yet carnal: for whereas there is among you envying, and strife, and divisions, are ye not carnal, and walk as men?
How are they carnal?
Among you there is:
Envy,
Strife,
divisions,
And therefore they are Carnal. Carnal Christians. Immature in both spiritual and their practical every day life.
1Co 3:4 For while one saith, I am of Paul; and another, I am of Apollos; are ye not carnal?
--They are carnal because of their divisiveness. Their church was divided into various sects. It was known for its divisiveness. There was a lot of carnality here.
Thus the description of 1Cor.2:14 described them. They could not understand the things of the Spirit of God because they walked according to the course of this world, and not according to the Spirit of God.