"Paul saw that “a great door and effectual” was opening before him, although there were “many adversaries.” 1 Corinthians 16:9 . Ephesus was not only the most magnificent, but the most corrupt, of the cities of Asia. Superstition and sensual pleasure held sway over her teeming population. Under the shadow of her temples, criminals of every grade found shelter, and the most degrading vices flourished. AA 286.1"
"For a great door and effectual is opened unto me, and there are many adversaries."
The EGW passage directly quotes 1 Corinthians 16:9 and uses it as a springboard to describe the situation in Ephesus.
"Ephesus was a popular center for the worship of Diana. The fame of the magnificent temple of “Diana of the Ephesians” extended throughout all Asia and the world. Its surpassing splendor made it the pride, not only of the city, but of the nation. The idol within the temple was declared by tradition to have fallen from the sky. Upon it were inscribed symbolic characters, which were believed to possess great power. Books had been written by the Ephesians to explain the meaning and use of these symbols. AA 286.2"
"So that not only this our craft is in danger to be set at nought; but also that the temple of the great goddess Diana should be despised, and her magnificence should be destroyed, whom all Asia and the world worshippeth."
The EGW passage directly references and expands upon the details mentioned in Acts 19:27 regarding the worship of Diana in Ephesus.