1 sn 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.
1 tn Grk “my brother.” Both “my brother or sister” earlier in the verse and “one of them” here translate the same Greek phrase. Since the same expression occurs in the previous line, a pronoun phrase is substituted here to suit English style, which is less tolerant of such repetition.