"efforts seem to them to be unappreciated or fruitless; their future is uncertain. MH 472.3"
"Then I said, I have laboured in vain, I have spent my strength for nought, and in vain: yet surely my judgment is with the Lord, and my work with my God."
Both passages express the feeling of laboring in vain or experiencing unappreciated efforts. EGW's statement about uncertain futures aligns with the sense of futility expressed in Isaiah.
"Let us remember that while the work we have to do may not be our choice, it is to be accepted as God's choice for us. Whether pleasing or unpleasing, we are to do the duty that lies nearest. “Whatsoever thy hand findeth to do, do it with thy might; for there is no work, nor device, nor knowledge, nor wisdom, in the grave, whither thou goest.” Ecclesiastes 9:10 . MH 472.4"
"Whatsoever thy hand findeth to do, do it with thy might; for there is no work, nor device, nor knowledge, nor wisdom, in the grave, whither thou goest."
Ellen White directly references Ecclesiastes 9:10 in this passage.