Commentaries:
Robertson's Word Pictures (NT)
Preach the word (khrucon ton logon). First aorist active imperative of khrussw. For "the word" used absolutely, see I Thessalonians 1:6; Galatians 6:6.
Be instant in season, out of season (episthqi eukairwv akairwv). Second aorist (ingressive) active imperative of efisthmi (intransitive use), "take a stand," "stand upon it or up to it," "carry on," "stick to it." The Vulgate has "insta." The two adverbs are like a proverb or a play (pun) on the word kairov. There are all sorts of seasons (kairoi), some difficult (xalepoi, II Timothy 3:1), some easy (eukairh, I Corinthians 16:12).
Reprove (elegcon). First aorist active imperative of elegxw. "Bring to proof." Ephesians 5:11.
Rebuke (epitimhson). First aorist active imperative of epitimaw, to give honour (or blame) to, to chide. Common in the Gospels (Luke 17:3).
Exhort (parakaleson). First aorist active imperative of parakalew, common Pauline word.
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