"***** Chapter 14—Power of the Truth The word of God was preached by His ministers in early days “in demonstration of the Spirit and of power.” The hearts of men were stirred by the proclamation of the gospel. Why is it that the preaching of the truth has now so little power to move the people? Is God less willing to bestow His blessing upon the laborers in His cause in this age than in the apostles’ day? 5T 157"
"And my speech and my preaching was not with enticing words of man’s wisdom, but in demonstration of the Spirit and of power:"
The EGW passage directly quotes 1 Corinthians 2:4.
"And when they had prayed, the place was shaken where they were assembled together; and they were all filled with the Holy Ghost, and they spake the word of God with boldness."
Both passages discuss the power of the Holy Spirit in preaching and its effects, although EGW doesn't directly allude to Acts 4:31.
"We profess to be governed by the same principles, to be influenced by the same spirit. But instead of giving all for Christ many have taken the golden wedge and a goodly Babylonish garment and hid them in the camp. If the presence of one Achan was sufficient to weaken the whole camp of Israel, can we be surprised at the little success which attends our efforts when every church and almost every family has its Achan? Let us individually go to work to stimulate others by our example of disinterested benevolence. The work might have gone forward with far greater power had all done what they could to supply the treasury with means. 5T 157.1"
"But the children of Israel committed a trespass in the accursed thing: for Achan, the son of Carmi, the son of Zabdi, the son of Zerah, of the tribe of Judah, took of the accursed thing: and the anger of the Lord was kindled against the children of Israel."
EGW explicitly refers to Achan and the 'golden wedge and a goodly Babylonish garment,' directly alluding to the story in Joshua 7. She uses the Achan story as an analogy for hidden sin and selfishness hindering the progress of the church.