"On the Indiana Camp Ground August 9-14, I attended the camp meeting near Kokomo, Ind., accompanied by my daughter-in-law, Mary K. White. My husband found it impossible for him to leave Battle Creek. At this meeting the Lord strengthened me to labor most earnestly. He gave me clearness and power to appeal to the people. As I looked upon the men and women assembled here, noble in appearance and commanding in influence, and compared them with the little company assembled six years before, who were mostly poor and uneducated, I could but exclaim, “What hath the Lord wrought!” LS 221"
"The Lord hath done great things for us; whereof we are glad."
EGW directly quotes the sentiment of Psalm 126:3, expressing gratitude for God's work. The phrase "What hath the Lord wrought!" is a clear allusion.
This movement embraced the Battle Creek Reform Club, six hundred strong, and the Woman's Christian Temperance Union, two hundred and sixty strong. God, Christ, the Holy Spirit, and the Bible were familiar words with these earnest workers. Much good had already been accomplished, and the activity of the workers, the system by which they labored, and the spirit of their meetings, promised greater good in time to come. LS 220.3 It was on the occasion of the visit of Barnum's great menagerie to this city, on the 28th of June, that the ladies of the Woman's Christian Temperance Union struck a telling blow for temperance and reform by organizing an immense temperance restaurant to accommodate the crowds of people who gathered in from the country to visit the menagerie, thus preventing them from visiting the saloons and groggeries, where they would be exposed to temptation. The mammoth tent, capable of holding five thousand people, used by the Michigan Conference for camp meeting purposes, wa…
"So mightily grew the word of God and prevailed."
Both passages describe a movement or activity that is growing and prevailing. While the context is different (temperance movement vs. the word of God), the underlying theme of increasing influence and success is present in both.