"jewel every one whose life is hid with Christ in Him. Of every such one He says: “I ...will make thee as a signet: for I have chosen thee.” [ Haggai 2:23 .] GW 478.2"
"In that day, saith the Lord of hosts, will I take thee, O Zerubbabel, my servant, the son of Shealtiel, saith the Lord, and will make thee as a signet: for I have chosen thee, saith the Lord of hosts."
Ellen White directly references Haggai 2:23 in this passage.