Hebrews 5:13

ὁ μετέχων γάλακτος, “who feeds on milk.”

ἄπειρος, “inexperienced.”

νήπιος. This is a frequent metaphor in St Paul, who also contrasts “babes” (νήπιοι) with the mature (τέλειοι), Galatians 4:3; 1 Corinthians 2:6; Ephesians 4:13-14. We are only to be “babes” in wickedness (1 Corinthians 14:20).

λόγου δικαιοσύνης, i.e. the Scriptures, and especially the Gospel (see 2 Timothy 3:16; Romans 1:17, “therein is the righteousness of God revealed”). The Hebrew צְדָקָה has almost the sense of ἀλήθεια.