"A beginning has been made in proclaiming the third angel's message in the city of Washington and in other cities of the South and the East; but in order to meet the mind of the Lord, we shall have to plan for the carrying forward of a far-reaching and systematic work. We must enter into this work with a perseverance that will not allow of any slackening of our efforts until we shall see of the salvation of God. 9T 99.1"
"The Lord hath made bare his holy arm in the eyes of all the nations; and all the ends of the earth shall see the salvation of our God."
The EGW passage uses the phrase 'see of the salvation of God,' which is a direct allusion to Isaiah 52:10. The context in both passages relates to the proclamation of God's message and the eventual salvation of people.
"In Portland, Maine; in Boston and the towns round about; in New York and the populous cities close by; in Philadelphia and Baltimore and Washington, the Lord desires us to proclaim the third angel's message with power. We cannot exercise this power ourselves, but we can choose men of capability and urge them to go into these avenues of opportunity and there proclaim the message in the power of the Holy Spirit. We must plan to place in these cities capable men who can present the third angel's message in a manner so forcible that it will strike home to the heart. Men who can do this work we cannot afford to gather into one place to do a work that others might do. 9T 99.2"
"But ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me both in Jerusalem, and in all Judea, and in Samaria, and unto the uttermost part of the earth."
The EGW passage echoes the sentiment of Acts 1:8, emphasizing the power of the Holy Spirit in proclaiming the message, particularly in specific locations. The connection is about receiving power to be witnesses.