en_tn/1co/03/01.md

spiritual people

People who live in the power of the Spirit.

fleshly people

People who follow their own desires.

as to babes in Christ

The Corinthians are compared to children very young in age and understanding. AT: "as to very young believers in Christ" (see: rc://en/ta/man/translate/figs-metaphor)

I fed you milk and not meat

The Corinthians can only take easy truths like babies that can only drink milk. They are not mature enough to understand greater truths like older children who now can eat food. (See: rc://en/ta/man/translate/figs-metaphor)

you are not ready

"you are not ready to understand the harder teachings about following Christ" (See: rc://en/ta/man/translate/figs-explicit)