1 Corinthians 3:1–3

But I, brothers, could not address you as spiritual people, but as people of the flesh, as infants in Christ. I fed you with milk, not solid food, for you were not ready for it. And even now you are not yet ready, for you are still of the flesh. For while there is jealousy and strife among you, are you not of the flesh and behaving only in a human way?

For my part, brothers and sisters, I was not able to speak to you as spiritual people but as people of the flesh, as babies in Christ. I gave you milk to drink, not solid food, since you were not yet ready for it. In fact, you are still not ready, because you are still worldly. For since there is envy and strife among you, are you not worldly and behaving like mere humans?

Dear brothers and sisters, when I was with you I couldn’t talk to you as I would to spiritual people. I had to talk as though you belonged to this world or as though you were infants in Christ. I had to feed you with milk, not with solid food, because you weren’t ready for anything stronger. And you still aren’t ready, for you are still controlled by your sinful nature. You are jealous of one another and quarrel with each other. Doesn’t that prove you are controlled by your sinful nature? Aren’t you living like people of the world?

And I, brothers, was not able to speak to you as to spiritual people, but as to fleshly people, as to infants in Christ. I gave you milk to drink, not solid food, for you were not yet able to eat it. But now you are still not able, for you are still fleshly. For where there is jealousy and strife among you, are you not fleshly, and do you not live like unregenerate people?

And I, brethren, could not speak unto you as unto spiritual, but as unto carnal, even as unto babes in Christ. 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. For ye are yet carnal: for whereas there is among you envying, and strife, and divisions, are ye not carnal, and walk as men?