Commentaries:
Robertson's Word Pictures (NT)
We are ambassadors therefore on behalf of Christ (uper Xristou oun presbeuomen). Old word from presbuv, an old man, first to be an old man, then to be an ambassador (here and Ephesians 6:20 with en alush in a chain added), common in both senses in the Greek. "The proper term in the Greek East for the Emperor's Legate" (Deissmann, Light from the Ancient East, p. 374), in inscriptions and papyri. So Paul has a natural pride in using this dignified term for himself and all ministers. The ambassador has to be persona grata with both countries (the one that he represents and the one to which he goes). Paul was Christ's Legate to act in his behalf and in his stead.
As though God were intreating by us (wv tou qeou parakalountov di hmwn). Genitive absolute with wv used with the participle as often to give the reason (apparent or real). Here God speaks through Christ's Legate.
Be ye reconciled to God (katallaghte tw qew). Second aorist passive imperative of katallassw and used with the dative case. "Get reconciled to God," and do it now. This is the ambassador's message as he bears it to men from God.
Other Robertson's Word Pictures (NT) entries containing 2 Corinthians 5:20:
1 Corinthians 7:11
Ephesians 6:20
Colossians 1:20
Colossians 1:22
1 John 2:2
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