I Corinthians 3:1-4, 18-20

And I, brethren, could not speak to you as to spiritual people but as to carnal, as to babes in Christ. I fed you with milk and not with solid food; for until now you were not able to receive it, and even now you are still not able; for you are still carnal. For where there are envy, strife, and divisions among you, are you not carnal and behaving like mere men? For when one says, “I am of Paul,” and another, “I am of Apollos,” are you not carnal?

Let no one deceive himself. If anyone among you seems to be wise in this age, let him become a fool that he may become wise. For the wisdom of this world is foolishness with God. For it is written, “He catches the wise in their own craftiness”; and again, “The LORD knows the thoughts of the wise, that they are futile.”