Scripture

1 Corinthians CHAP. II.
Hee declareth that his preaching, 1 though it bring not excellency of speech, or of 4 humane wisedome: yet consisteth in the 4. 5 power of God: and so farre excelleth 6 the wisedome of this world, and 9 humane sense, as that 14 the naturall man cannot vnderstand it.

The natural man cannot discern.

1 Corinthians 2
1 And I, brethren, when I came to you, came not with excellencie of speech, or of wisedome, declaring vnto you the testimony of God.
2 For I determined not to know any thing amōg you, saue Iesus Christ, and him crucified.
3 And I was with you in weakenesse, and in feare, and in much trembling.
4 And my speech, and my preaching was not with entising words of mans wisedome, but in demonstration of the Spirit, and of power:
5 That your faith should not stand in the wisdome of men, but in the power of God.
6 Howbeit wee speake wisedome among them that are perfect: yet not the wisedome of this worlde, nor of the Princes of this worlde, that come to nought:
7 But wee speake the wisedome of God in a mysterie, euen the hidden wisedome which God ordeined before the world, vnto our glory.
8 Which none of the princes of this world knewe: for had they knowen it, they would not haue crucified the Lord of glory.
9 But as it is written, Eye hath not seene, nor eare heard, neither haue entred into the heart of man, the things which God hath prepared for them that loue him.9
10 But God hath reueiled them vnto vs by his Spirit: for the Spirit searcheth all things, yea, the deepe things of God.
11 For what man knoweth the things of a man, saue the spirit of man which is in him? Euen so the things of God knoweth no man, but the Spirit of God.
12 Now wee haue receiued, not the spirit of the world, but the Spirit which is of God, that wee might know the things that are freely giuen to vs of God.
13 Which things also we speake, not in the words which mans wisedome teacheth, but which the holy Ghost teacheth, comparing spiritual things with spirituall.
14 But the naturall man receiueth not the things of the Spirit of God, for they are foolishnesse vnto him: neither can he know them, because they are spiritually discerned.
15 But he that is spirituall, iudgeth all things, yet he himselfe is iudged of no man.
16 For who hath knowen the mind of the Lord that he may instruct him? But we haue the mind of Christ.

We see who is spiritual. It is he that judgeth all things yet he himself is judged of no man.

(Matthew 16:3-4 [KJV])
 [3] And in the morning, It will be foul weather to day: for the sky is red and lowring. O ye hypocrites, ye can discern the face of the sky; but can ye not discern the signs of the times?
 [4] A wicked and adulterous generation seeketh after a sign; and there shall no sign be given unto it, but the sign of the prophet Jonas. And he left them, and departed.

He or she can discern the sign of the times.

(I Corinthians 11:29 [KJV]) For he that eateth and drinketh unworthily, eateth and drinketh damnation to himself, not discerning the Lord’s body.

He or she can take communion without damnation to himself.

(I Corinthians 12:8-11 [KJV])
 [8] For to one is given by the Spirit the word of wisdom; to another the word of knowledge by the same Spirit;
 [9] To another faith by the same Spirit; to another the gifts of healing by the same Spirit;
 [10] To another the working of miracles; to another prophecy; to another discerning of spirits; to another divers kinds of tongues; to another the interpretation of tongues:
 [11] But all these worketh that one and the selfsame Spirit, dividing to every man severally as he will.

There is also a gift called discerning of spirits.

(Hebrews 4:12 [KJV]) For the word of God is quick, and powerful, and sharper than any twoedged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow, and is a discerner of the thoughts and intents of the heart.

The word of God can be used to discern the thoughts and intents of the heart.

(Hebrews 5:13-14 [KJV])
 [13] For every one that useth milk is unskilful in the word of righteousness: for he is a babe.
 [14] But 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.

He or she can discern both good and evil.

Also nobody can be spiritual unless he or she acknowledges that women should be silent in the church.

How to deal with a spiritual person?

Respect him or her and listen to what he or she has to say.