Paul
1 Corinthians 2
1 When I came to you, brothers, I did not come with eloquence or superior wisdom as I proclaimed to you the testimony about God. [a] 2 For I resolved to know nothing while I was with you except Jesus Christ and him crucified. 3 I came to you in weakness and fear, and with much trembling. 4 My message and my preaching were not with wise and persuasive words, but with a demonstration of the Spirit's power, 5 so that your faith might not rest on men's wisdom, but on God's power.
Wisdom From the Spirit
6 We do, however, speak a message of wisdom among the mature, but not the wisdom of this age or of the rulers of this age, who are coming to nothing. 7 No, we speak of God's secret wisdom, a wisdom that has been hidden and that God destined for our glory before time began. 8 None of the rulers of this age understood it, for if they had, they would not have crucified the Lord of glory. 9 However, as it is written:
"No eye has seen,
no ear has heard,
no mind has conceived
what God has prepared for those who love him" [b] — 10 but God has revealed it to us by his Spirit.
The Spirit searches all things, even the deep things of God. 11 For who among men knows the thoughts of a man except the man's spirit within him? In the same way no one knows the thoughts of God except the Spirit of God. 12 We have not received the spirit of the world but the Spirit who is from God, that we may understand what God has freely given us. 13 This is what we speak, not in words taught us by human wisdom but in words taught by the Spirit, expressing spiritual truths in spiritual words. [c] 14 The man without the Spirit does not accept the things that come from the Spirit of God, for they are foolishness to him, and he cannot understand them, because they are spiritually discerned. 15 The spiritual man makes judgments about all things, but he himself is not subject to any man's judgment:
16 "For who has known the mind of the Lord
that he may instruct him?" [d] But we have the mind of Christ.
1 Corinthians 4
Apostles of Christ
1 So then, men ought to regard us as servants of Christ and as those entrusted with the secret things of God. 2 Now it is required that those who have been given a trust must prove faithful. 3 I care very little if I am judged by you or by any human court; indeed, I do not even judge myself. 4 My conscience is clear, but that does not make me innocent. It is the Lord who judges me. 5 Therefore judge nothing before the appointed time; wait till the Lord comes. He will bring to light what is hidden in darkness and will expose the motives of men's hearts. At that time each will receive his praise from God.
6 Now, brothers, I have applied these things to myself and Apollos for your benefit, so that you may learn from us the meaning of the saying, "Do not go beyond what is written." Then you will not take pride in one man over against another. 7 For who makes you different from anyone else? What do you have that you did not receive? And if you did receive it, why do you boast as though you did not?
"Do not go beyond what is written." needs to be understood according to Paul. What did he mean by it?
Other then that, In a shorter nutshell, I believe all he was saying is we will be judged by what’s in our hearts as individuals not by what we know of the bible or any other book.
Herein lay a clue to Jesus the man and his Nazarean Party followers. What were those traditional messianics ;up too, carrying swords and counting zealots in their number?
Exactly Why Paul said what he said to the congregation, be careful when believing everything you hear/read/ and maybe even see, including him.