We have already observed that Paul emphasizes God’s glory in his letter to the Ephesians. I believe this was an intentional contrast/comparison to the praise often lavished on Artemis and her temple by her worshipers. Her temple was one of the seven wonders of the ancient world. The riches stored within her chambers were probably unmatched anywhere else in their world. And the legend of her ancient visitation to Ephesus in the form of a powerful meteor led many to seek her help and favor even into the 1st Century.
But Paul had taught the believers in Ephesus that Artemis was not a real god, and in fact was not real at all (Acts 19:23-27)! Likely he is now also reminding them of what he had previous taught them in person: that at the power, riches and glory really resided in the One True God in which they now believed.