"Working the Cities from Outpost Centers In the course of her talk before the conference, Mrs. White exalted the sacredness of God's law, and spoke decidedly regarding the necessity of prompt action and of acquainting the people with the meaning of the things coming upon the earth. She referred particularly to the advantages to be gained by working the cities from outpost centers. LS 409"
"And this gospel of the kingdom shall be preached in all the world for a witness unto all nations; and then shall the end come."
Both passages relate to spreading a message to the world. Matthew 24:14 speaks of preaching the gospel to all nations before the end, while the EGW passage discusses working in cities to share a message. The connection is that both are about spreading a message to a large population.
"“Much more instruction regarding the long-sufferance of God and the necessity of arousing transgressors to a realization of their perilous position in His sight, was repeated to the people, as received from my instructor.” Testimonies for the Church 9:92-94 . LS 409.1"
"The Lord is not slack concerning his promise, as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance."
Both passages emphasize God's longsuffering and the need for people to recognize their sinful state and turn to Him. The EGW passage speaks of arousing transgressors, while 2 Peter 3:9 explains God's patience as a desire for all to repent.
"“Out of the cities, out of the cities!” she declared; “this is the message the Lord has been giving me. The earthquakes will come; the floods will come; and we are not to establish ourselves in the wicked cities, where the enemy is served in every way, and where God is so often forgotten. The Lord desires that we shall have clear spiritual eyesight. We must be quick to discern the peril that would attend the establishment of institutions in these wicked cities. We must make wise plans to warn the cities, and at the same time live where we can shield our children and ourselves from the contaminating and demoralizing influences so prevalent in these places. The Review and Herald, July 5, 1906 . LS 409.5"
"And I heard another voice from heaven, saying, Come out of her, my people, that ye be not partakers of her sins, and that ye receive not of her plagues."
The EGW passage echoes the call to separate from wickedness and impending destruction found in Revelation 18:4. While not a direct quote, the sentiment and urgency are clearly aligned.