It says "indeed he CANNOT (zero spirituality) discern the things of the Spirit.
Yes and I know belivers today that cannot discern the THINGS of the Spirit . Why ? well read on brother ...
1¶And I, brethren,
could not speak ( well what do we have here ? ) unto you as unto spiritual, but as unto carnal,
even as unto babes in Christ.
2I have fed you with milk, and not with meat: for hitherto ye were
⁷not able ( what was that ? not able) to bear it, neither yet
are you now able ( what was that again ? THEY ARE NOT YET ABLE . AGAIN . THEY ARE NOT...ABLE !!!!!
Why ? because they are spiritually discerned . Not because they are not saved ,they clearly are believers . But just like Hebrews 5 , some believers are yet unable to discern the THINGS ( what things ? Read 1 cor 2 .6 ) of the Spirit unless they stop being Carnal ( or stop believing in Calvinism )
Hebrews 5 ( same context )
11Of whom we have many things to say, and hard to be uttered, seeing ye are dull of hearing.
12¶For when for the time ye ought to be teachers, ye have need that one teach you again which
be the first principles of the oracles of God; and are become such as have need of milk, and not of strong meat.
13For every one that useth milk
is unskilful in the word of righteousness: for he is a babe.
14But strong meat belongeth to them that are of full age,
even those who by reason of use have their senses exercised to discern both good and evil.
12Now we have received, not the spirit of the world, but the spirit which is of God; that we
might know the things that are freely given to us of God.
Its not automatic. Paul wants to speak the THINGS ( VERSE 6 ) he can speak amoung the mature . They Are able to bear the meat .