1 Corinthians 3:1-4, 18-20

And I, brethren, could not speak unto you as unto spiritual, but as unto carnal, as unto babes in Christ. I fed you with milk, not with meat; for ye were not yet able to bear it: nay, not even now are ye able; for ye are yet carnal: for whereas there is among you jealousy and strife, are ye not carnal, and do ye not walk after the manner of men? For when one saith, I am of Paul; and another, I am of Apollos; are ye not men?

Let no man deceive himself. If any man thinketh that he is wise among you in this world, 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 that taketh the wise in their craftiness: and again, The Lord knoweth the reasonings of the wise, that they are vain.