"Many of the believers to whom Peter addressed his letters, were living in the midst of heathen, and much depended on their remaining true to the high calling of their profession. The apostle urged upon them their privileges as followers of Christ Jesus. “Ye are a chosen generation,” he wrote, “a royal priesthood, an holy nation, a peculiar people; that ye should show forth the praises of Him who hath called you out of darkness into His marvelous light: which in time past were not a people, but are now the people of God: which had not obtained mercy, but now have obtained mercy. AA 521.3"
"But ye are a chosen generation, a royal priesthood, an holy nation, a peculiar people; that ye should shew forth the praises of him who hath called you out of darkness into his marvellous light:"
The EGW passage directly quotes 1 Peter 2:9, making it an explicit allusion.
"Which in time past were not a people, but are now the people of God: which had not obtained mercy, but now have obtained mercy."
The EGW passage directly quotes 1 Peter 2:10, making it an explicit allusion.