"That which God purposed to do for the world through Israel, the chosen nation, He will finally accomplish through His church on earth today. He has “let out His vineyard unto other husbandmen,” even to His covenant- keeping people, who faithfully “render Him the fruits in their seasons.” Never has the Lord been without true representatives on this earth who have made His interests their own. These witnesses for God are numbered among the spiritual Israel, and to them will be fulfilled all the covenant promises made by Jehovah to His ancient people. PK 713.1"
"They say unto him, He will miserably destroy those wicked men, and will let out his vineyard unto other husbandmen, which shall render him the fruits in their seasons."
EGW directly quotes and interprets Matthew 21:41, applying the parable of the vineyard to the church today.
"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:"
Both passages discuss the concept of a chosen people and their role in showing forth God's praises. EGW connects this to the church as the 'spiritual Israel,' echoing the idea of a chosen generation in 1 Peter 2:9.
"Not as though the word of God hath taken none effect. For they are not all Israel, which are of Israel:"
Romans 9:6 discusses the distinction between physical and spiritual Israel. EGW's statement about 'spiritual Israel' directly relates to this concept, suggesting that not all who are physically descended from Israel are part of the true, covenant-keeping people of God.