John Calvin Reformed @genevareformer

2. I have fed you with milk Here it is asked, whether Paul transformed Christ to suit the diversity of his hearers. I answer, that this refers to the manner and form of his instructions, rather than to the substance of the doctrine.

Matthew Henry Presbyterian @wholebiblehenry

Here, I. Paul blames the Corinthians for their weakness and nonproficiency. Those who are sanctified are so only in part: there is still room for growth and increase both in grace and knowledge, Pe2 3:18. Those who through divine grace are renewed to a spiritual life may yet in many things be defective.

Commenting on 1 Corinthians 3:1-4

John Gill Reformed Baptist @doctorgill

I have fed you with milk,.... It is usual with the Jews to compare the law to milk, and they say (c), that "as milk strengthens and nourishes an infant, so the law strengthens and nourishes the soul;'' but the apostle does not here mean , "the milk of the law", as they (d) call it, but the Gospel; comparable to milk, for its purity...