Why is pride and giving the impression you are more spiritual than others wrong in the church?
Pride and giving the impression you are more spiritual are wrong because they puff believers up against one another, divide the congregation over leaders like Paul, Apollos, or Peter, and put men above what is written. Such behavior is carnal and infantile, and it ignores the question of who makes a believer differ.
Les explains that the Corinthians were getting puffed up, each claiming importance because he followed Peter or Paul, and Paul transferred the example to himself and Apollos so they would learn not to think of men above what is written. Les says this shows how infantile and carnal they still were. The point is practical: you cannot get puffed up and give someone the impression you are better or more spiritually blessed than others. Verse 7 then asks who makes thee to differ.
And these things, brethren, I have in a figure transferred to myself and to Apollos for your sakes; that ye might learn in us not to think of men above that which is written, that no one of you be puffed up for one against another.
For who maketh thee to differ from another? and what hast thou that thou didst not receive? now if thou didst receive it, why dost thou glory, as if thou hadst not received it?
What problem in the Corinthian church was Paul addressing in 1 Corinthians 4:6-7?
Paul addressed Corinthian pride and party rivalry: members were puffed up, each claiming superiority or leadership because they followed Paul, Apollos, or Peter. He transferred the example to himself and Apollos so they would learn not to exalt men above what is written and not boast against one another.
Why is it wrong to give others the impression that you are more spiritually blessed than they are?
It is wrong because it breeds carnal pride and division, puffing believers up against one another and exalting human leaders above what is written. Paul insists no one should be puffed up for one against another, since no person makes himself to differ spiritually.