"“Ye are My witnesses, saith the Lord, and My servant whom I have chosen: that ye may know and believe Me, and understand that I am He: before Me there was no God formed, neither shall there be after Me. I, even I, am the Lord; and beside Me there is no Saviour. I have declared, and have saved, and I have showed, when there was no strange god among you: therefore ye are My witnesses.” “I the Lord have called thee in righteousness, and will hold thine hand, and will keep thee, and give thee for a covenant of the people, for a light of the Gentiles; to open the blind eyes, to bring out the prisoners from the prison, and them that sit in darkness out of the prison house.” Isaiah 43:10-12 ; 42:6, 7 . AA 10.1"
"Ye are my witnesses, saith the Lord, and my servant whom I have chosen: that ye may know and believe me, and understand that I am he: before me there was no God formed, neither shall there be after me."
EGW directly quotes Isaiah 43:10.
"Ye are my witnesses, saith the Lord, and my servant whom I have chosen: that ye may know and believe me, and understand that I am he: before me there was no God formed, neither shall there be after me. I, even I, am the Lord; and beside me there is no saviour. I have declared, and have saved, and I have shewed, when there was no strange god among you: therefore ye are my witnesses, saith the Lord, that I am God."
Ellen White directly references Isaiah 43:10-12 in this passage.
"And he said, It is a light thing that thou shouldest be my servant to raise up the tribes of Jacob, and to restore the preserved of Israel: I will also give thee for a light to the Gentiles, that thou mayest be my salvation unto the end of the earth."
EGW alludes to Isaiah 49:6, specifically the phrase 'light to the Gentiles,' which is present in both texts.
"“In an acceptable time have I heard thee, and in a day of salvation have I helped thee: and I will preserve thee, and give thee for a covenant of the people, to establish the earth, to cause to inherit the desolate heritages; that thou mayest say to the prisoners, Go forth; to them that are in darkness, Show yourselves. They shall feed in the ways, and their pastures shall be in all high places. They shall not hunger nor thirst; neither shall the heat nor sun smite them: for He that hath mercy on them shall lead them, even by the springs of water shall He guide them. And I will make all My mountains a way, and My highways shall be exalted.... AA 10.2"
"Thus saith the Lord, In an acceptable time have I heard thee, and in a day of salvation have I helped thee: and I will preserve thee, and give thee for a covenant of the people, to establish the earth, to cause to inherit the desolate heritages;"
The EGW passage directly quotes Isaiah 49:8, making it a clear and explicit allusion.