Acts 14:12 - Clarke's commentary and critical notes on the Bible

And they called Barnabas, Jupiter; and Paul, Mercurius, because he was the chief speaker. They called Barnabas, Jupiter; and Paul, Mercurius - The heathens supposed that Jupiter and Mercury were the gods who most frequently assumed the human form; and Jupiter was accustomed to take Mercury with him on such expeditions. Jupiter was the supreme god of the heathens; and Mercury was by them considered the god of eloquence. And the ancient fable, from which I have quoted so largely above, represents Jupiter and Mercury coming to this very region, where they were entertained by Lycaon, from whom the Lycaonians derived their name. See the whole fable in the first book of Ovid's Metamorphoses. As the ancients usually represented Jupiter as rather an aged man, large, noble, and majestic; and Mercury young, light, and active, the conjecture of Chrysostom is very probable, that Barnabas was a large, noble, well-made man, and probably in years; and St. Paul, young, active, and eloquent; on which account, they termed the former Jupiter, and the latter Mercury. That Mercury was eloquent and powerful in his words is allowed by the heathens; and the very epithet that is applied here to Paul, ην ὁ ἡγουμενος του λογου, he was the chief or leader of the discourse, was applied to Mercury. So Jamblichus de Myster. Init. Θεος ὁ των λογων ἡγεμων ὁ Ἑρμης. And Macrobius, Sat. i.:8: Scimus Mercurium vocis et sermonis potentem. We know that Mercury is powerful both in his voice and eloquence. With the Lycaonians, the actions of these apostles proved them to be gods; and the different parts they took appeared to them to fix their character, so that one was judged to be Jupiter, and the other Mercury.