"Living faith in the merits of a crucified Redeemer will carry them through the fiery furnace of affliction and trial. The form of the Fourth will be with them in the fierce heat of the furnace, which will not leave even the smell of fire upon their garments. Children should be encouraged to become Bible students and to have firm religious principles that will stand the test of the perils sure to be experienced by all who live upon the earth during the last days in the closing history of the world. 4T 212.3"
"He answered and said, Lo, I see four men loose, walking in the midst of the fire, and they have no hurt; and the form of the fourth is like the Son of God."
The EGW passage directly references the story of the fiery furnace in Daniel 3 and the presence of the 'form of the Fourth,' making it a clear allusion.