It is one thing for a person to humbly say that they follow Paul in what he was given by the Lord to preach and teach the Gentiles.
It is another thing to become arrogant; puffed up that one follows Paul in what he was given by the Lord to preach and teach the Gentiles.
This second example is the issue Paul is dealing with in 1 Corinthians 1 thru 3.
1 Corinthians 3:1 And I, brethren, could not speak unto you as unto spiritual, but as unto carnal, even as unto babes in Christ. 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. 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? 3:4 For while one saith, I am of Paul; and another, I am of Apollos; are ye not carnal?
Whereas he refers to the first example of the two I wrote of in my above, in the following...
1 Corinthians 4:14 I write not these things to shame you, but as my beloved sons I warn you. 4:15 For though ye have ten thousand instructors in Christ, yet have ye not many fathers: for in Christ Jesus I have begotten you through the gospel. 4:16 Wherefore I beseech you, be ye followers of me. 4:17 For this cause have I sent unto you Timotheus, who is my beloved son, and faithful in the Lord, who shall bring you into remembrance of my ways which be in Christ, as I teach every where in every church.