"And a writer in the Religious Telescope testified: “We have never witnessed such a general declension of religion as at the present. Truly, the church should awake, and search into the cause of this affliction; for as an affliction everyone that loves Zion must view it. When we call to mind how ‘few and far between’ cases of true conversion are, and the almost unparalleled impertinence and hardness of sinners, we almost involuntarily exclaim, ‘Has God forgotten to be gracious? or, Is the door of mercy closed?’” GC 377.2"
"Hath God forgotten to be gracious? hath he in anger shut up his tender mercies? Selah."
The EGW passage quotes a writer who uses the exact phrase "Has God forgotten to be gracious?" which is directly from Psalm 77:9. This is more than a thematic parallel; it's a direct quotation within a quotation.
Such a condition never exists without cause in the church itself. The spiritual darkness which falls upon nations, upon churches and individuals, is due, not to an arbitrary withdrawal of the succors of divine grace on the part of God, but to neglect or rejection of divine light on the part of men. A striking illustration of this truth is presented in the history of the Jewish people in the time of Christ. By their devotion to the world and forgetfulness of God and His word, their understanding had become darkened, their hearts earthly and sensual. Thus they were in ignorance concerning Messiah's advent, and in their pride and unbelief they rejected the Redeemer. God did not even then cut off the Jewish nation from a knowledge of, or a participation in, the blessings of salvation. But those who rejected the truth lost all desire for the gift of Heaven. They had “put darkness for light, and light for darkness,” until the light which was in them became darkness; and how great was that da…
"And this is the condemnation, that light is come into the world, and men loved darkness rather than light, because their deeds were evil."
The EGW passage discusses the rejection of divine light leading to spiritual darkness, mirroring the concept in John 3:19 where people prefer darkness to light because their deeds are evil. While not a direct quote, the theme is strongly echoed.