>>17763066Interesting points and I agree it doesn't make any sense for Luke to use Marcion.
>>17763091After rereading the Apology, you're right that there's no explicit argument against Marcion, I guess I got it mixed up with Justin's promotion in other chapters of the OT prophets testifying of Jesus, so indirect at best.
Justin in Greek:
https://earlywritings.com/forum/viewtopic.php?t=1874
Dialogue ch 100 quotes Matthew and Luke and uses the term ἀπομνημονεύμασι τῶν ἀποστόλων (memoirs of the apostles) right after mentioning Peter, although it isn't clear if Peter is meant to be included among them.
Ch 106 mentions ἀπομνημονεύμασιν αὐτοῦ (memoirs of him) with "him" referring to either Jesus (which would give no indication of authorship) or alternatively to Peter (which could refer to canonical GMark if he was aware of the tradition that John Mark was the secretary of Peter, or a noncanonical text like the gospel of Peter).
I assume by "apostles" Justin believes the authors were members of the Twelve and eye-witnesses to Jesus, and I'd lean towards excluding Luke from being an apostle and Justin thus directly speaking against authorship by Luke the Physician. Ch 42 of the Dialogue speaks of the twelve bells of the high priest's robe symbolizing the twelve apostles (δώδεκα ἀποστόλων). I don't think Justin included Paul the 13th apostle among his "apostles" either. While Acts might be seen as a "memoir of Paul by Luke" analogous to Mark's memoir of Peter, GLuke could hardly be a "memoir of the apostles" if he thought Luke the Physician was the author (the traditional view is that Luke recorded the additional stories of another non-apostle, Jesus' mother Mary).
Note also that Justin never quotes from Acts and probably was not aware that it existed, and never names Paul, but must've been aware of at least some Pauline epistles on account of living in Rome. Perhaps he never quotes from them because Marcion had just collected ten such letters into a codex.