"Zacharias well knew how to Abraham in his old age a child was given because he believed Him faithful who had promised. But for a moment the aged priest turns his thought to the weakness of humanity. He forgets that what God has promised, He is able to perform. What a contrast between this unbelief and the sweet, childlike faith of Mary, the maiden of Nazareth, whose answer to the angel's wonderful announcement was, “Behold the handmaid of the Lord; be it unto me according to thy word”! Luke 1:38 . DA 98.2"
"And Mary said, Behold the handmaid of the Lord; be it unto me according to thy word. And the angel departed from her."
EGW directly quotes Luke 1:38.
"Through faith also Sara herself received strength to conceive seed, and was delivered of a child when she was past age, because she judged him faithful who had promised."
Both passages refer to the faith of Sarah (Abraham's wife) in conceiving a child in old age, highlighting God's faithfulness to His promises. EGW draws a parallel between this and Zacharias' situation.
"The birth of a son to Zacharias, like the birth of the child of Abraham, and that of Mary, was to teach a great spiritual truth, a truth that we are slow to learn and ready to forget. In ourselves we are incapable of doing any good thing; but that which we cannot do will be wrought by the power of God in every submissive and believing soul. It was through faith that the child of promise was given. It is through faith that spiritual life is begotten, and we are enabled to do the works of righteousness. DA 98.3"
"For I know that in me (that is, in my flesh,) dwelleth no good thing: for to will is present with me; but how to perform that which is good I find not."
EGW's statement about our inability to do good in ourselves and the need for God's power aligns directly with the principle expressed in Romans 7:18.
"To the question of Zacharias, the angel said, “I am Gabriel, that stand in the presence of God; and am sent to speak unto thee, and to show thee these glad tidings.” Five hundred years before, Gabriel had made known to Daniel the prophetic period which was to extend to the coming of Christ. The knowledge that the end of this period was near had moved Zacharias to pray for the Messiah's advent. Now the very messenger through whom the prophecy was given had come to announce its fulfillment. DA 98.4"
"And the angel answering said unto him, I am Gabriel, that stand in the presence of God; and am sent to speak unto thee, and to shew thee these glad tidings."
EGW directly quotes Luke 1:19.