"While in Ephesus, Apollos “began to speak boldly in the synagogue.” Among his hearers were Aquila and Priscilla, who, perceiving that he had not yet received the full light of the gospel, “took him unto them, and expounded unto him the way of God more perfectly.” Through their teaching he obtained a clearer understanding of the Scriptures and became one of the ablest advocates of the Christian faith. AA 270.1"
"And he began to speak boldly in the synagogue: whom when Aquila and Priscilla had heard, they took him unto them, and expounded unto him the way of God more perfectly."
The EGW passage directly quotes and elaborates on the events described in Acts 18:26, making it a clear explicit allusion.
"Apollos was desirous of going on into Achaia, and the brethren at Ephesus “wrote, exhorting the disciples to receive him” as a teacher in full harmony with the church of Christ. He went to Corinth, where, in public labor and from house to house, “he mightily convinced the Jews, ... showing by the Scriptures that Jesus was Christ.” Paul had planted the seed of truth; Apollos now watered it. The success that attended Apollos in preaching the gospel led some of the believers to exalt his labors above those of Paul. This comparison of man with man brought into the church a party spirit that threatened to hinder greatly the progress of the gospel. AA 270.2"
"And when he was disposed to pass into Achaia, the brethren wrote, exhorting the disciples to receive him: who, when he was come, helped them much which had believed through grace:"
The EGW passage directly quotes Acts 18:27.
"During the year and a half that Paul had spent in Corinth, he had purposely presented the gospel in its simplicity. “Not with excellency of speech or of wisdom” had he come to the Corinthians; but with fear and trembling, and “in demonstration of the Spirit and of power,” had he declared “the testimony of God,” that their “faith should not stand in the wisdom of men, but in the power of God.” 1 Corinthians 2:1, 4, 5 . AA 270.3"
"And my speech and my preaching was not with enticing words of man’s wisdom, but in demonstration of the Spirit and of power:"
The EGW passage directly quotes 1 Corinthians 2:4.