3 Milk refers figuratively to basic or elementary Christian teaching. Paul’s point was that the Corinthian believers he was writing to here were not mature enough to receive more advanced teaching. This was not a problem at the time, when they were recent converts, but the problem now is that they are still not ready.

In other versions

I fed you with milk, not solid food, for you were not ready for it. And even now you are not yet ready,

I gave you milk, not solid food, for you were not yet ready for it. Indeed, you are still not ready.

I gave you milk to drink, not solid food, since you were not yet ready for it. In fact, you are still not ready,

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,

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,

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.

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