"Some have been so indiscreet as to talk out their pro-slavery principles—principles which are not heaven- born, but proceed from the dominion of Satan. These restless spirits talk and act in a manner to bring a reproach upon the cause of God. I will here give a copy of a letter written to Brother A, of Oswego County, New York: 1T 358.2"
"For the name of God is blasphemed among the Gentiles through you, as it is written."
The EGW passage describes how the actions of some individuals bring reproach upon the cause of God, which is a direct parallel to Romans 2:24, where the actions of some cause God's name to be blasphemed. The context of actions reflecting poorly on God's name is the key connection.
"This wisdom descendeth not from above, but is earthly, sensual, devilish."
The EGW passage directly contrasts 'heaven-born' principles with those originating from Satan, mirroring the contrast in James 3:15 between wisdom from above and that which is 'earthly, sensual, devilish.' The context of pro-slavery principles being 'devilish' strengthens the connection.
"Wherefore by their fruits ye shall know them."
The EGW passage discusses how the actions and words of pro-slavery advocates reveal the nature of their principles. This aligns with the principle in Matthew 7:20 that one can discern the nature of something by its fruits (actions, words, results).