The escaped slaves have been told by their masters that the Northern men wanted to get possession of them that they might cruelly misuse them; that the abolitionists would treat them worse than they had been treated while in slavery. All manner of horrible stories have been repeated in their ears to make them detest the North, and yet they have had a confused idea that some hearts in the North felt for their grievances and would yet make an effort to help them. This has been the only star which has shed its glimmering light upon their distressed and gloomy bondage. The manner in which the poor slaves have been treated has led them to believe that their masters have told them the truth in these things. And yet a national fast is proclaimed! Saith the Lord: “Is not this the fast that I have chosen? to loose the bands of wickedness, to undo the heavy burdens, and to let the oppressed go free, and that ye break every yoke?” When our nation observes the fast which God has chosen, then will …
"And ye shall know the truth, and the truth shall make you free."
EGW directly quotes Isaiah 58:6, which is about true fasting involving justice and freeing the oppressed. This directly relates to the context of slavery and the proclaimed national fast. The connection to John 8:32 is less direct, but the theme of freedom is present.
"Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it."
John 8:44 describes the devil as a liar and the father of lies. EGW describes slave owners spreading lies to the slaves. While not a direct quote or explicit allusion, the thematic parallel of deception and lies being used to control and manipulate is present.
"I was shown that if the object of this war had been to exterminate slavery, then, if desired, England would have helped the North. But England fully understands the existing feelings in the Government, and that the war is not to do away slavery, but merely to preserve the Union; and it is not for her interest to have it preserved. Our Government has been very proud and independent. The people of this nation have exalted themselves to heaven, and have looked down upon monarchical governments, and triumphed in their boasted liberty, while the institution of slavery, that was a thousand times worse than the tyranny exercised by monarchial governments, was suffered to exist and was cherished. In this land of light a system is cherished which allows one portion of the human family to enslave another portion, degrading millions of human beings to the level of the brute creation. The equal of this sin is not to be found in heathen lands. 1T 258.2"
"And thou, Capernaum, which art exalted to heaven, shalt be thrust down to hell."
Both passages use the phrase 'exalted to heaven' to describe a situation of pride and impending judgment. The EGW passage speaks of the nation's pride and hypocrisy, while Luke 10:15 speaks of Capernaum's pride. The thematic parallel is clear.