"With uplifted heads, with the bright beams of the Sun of Righteousness shining upon them, with rejoicing that their redemption draweth nigh, they go forth to meet the Bridegroom, saying, “Lo, this is our God; we have waited for Him, and He will save us.” Isaiah 25:9 . COL 421.1"
"And it shall be said in that day, Lo, this is our God; we have waited for him, and he will save us: this is the Lord; we have waited for him, we will be glad and rejoice in his salvation."
Ellen White directly references Isaiah 25:9 in this passage.
"And when these things begin to come to pass, then look up, and lift up your heads; for your redemption draweth nigh."
Both passages speak of redemption drawing near and encourage a hopeful, expectant attitude. While EGW also quotes Isaiah 25:9, the connection to Luke 21:28 is valid.
"“And I heard as it were the voice of a great multitude, and as the voice of many waters, and as the voice of mighty thunderings, saying, Alleluia; for the Lord God omnipotent reigneth. Let us be glad and rejoice, and give honour to Him; for the marriage of the Lamb is come, and His wife hath made herself ready.... And he saith unto me, Write, Blessed are they which are called unto the marriage supper of the Lamb.” “He is Lord of lords, and King of kings; and they that are with Him are called, and chosen, and faithful.” Revelation 19:6-9 ; 17:14 . COL 421.2"
"And I heard as it were the voice of a great multitude, and as the voice of many waters, and as the voice of mighty thunderings, saying, Alleluia: for the Lord God omnipotent reigneth. Let us be glad and rejoice, and give honour to him: for the marriage of the Lamb is come, and his wife hath made herself ready. And to her was granted that she should be arrayed in fine linen, clean and white: for the fine linen is the righteousness of saints. And he saith unto me, Write, Blessed are they which are called unto the marriage supper of the Lamb. And he saith unto me, These are the true sayings of God."
EGW directly quotes Revelation 19:6-9, making this a clear and explicit allusion.
"These shall make war with the Lamb, and the Lamb shall overcome them: for he is Lord of lords, and King of kings: and they that are with him are called, and chosen, and faithful."
EGW directly quotes Revelation 17:14, making this a clear and explicit allusion.