"In fields where the conditions are so objectionable and disheartening that many are unwilling to go to them, remarkable changes have been wrought by the efforts of self-sacrificing workers. Patiently and perseveringly they labored, not relying upon human power, but upon God, and His grace sustained them. The amount of good thus accomplished will never be known in this world, but blessed results will be seen in the great hereafter. MH 153.4 Self-Supporting Missionaries In many places self-supporting missionaries can work successfully. It was as a self-supporting missionary that the apostle Paul labored in spreading the knowledge of Christ throughout the world. While daily teaching the gospel in the great cities of Asia and Europe, he wrought at the trade of a craftsman to sustain himself and his companions. His parting words to the elders of Ephesus, showing his manner of labor, have precious lessons for every gospel worker: MH 154"
"And let us not be weary in well doing: for in due season we shall reap, if we faint not."
Both passages encourage perseverance in good works, promising a future reward for those who do not give up. The EGW passage illustrates this principle through the example of self-sacrificing missionaries.
"I have planted, Apollos watered; but God gave the increase."
The EGW passage describes the work of missionaries and how God provides the increase. The verse from 1 Corinthians makes the same point about the division of labor and God's role in growth.
"“Ye know,” he said, “after what manner I have been with you at all seasons: ... and how I kept back nothing that was profitable unto you, but have showed you, and have taught you publicly, and from house to house.... I have coveted no man's silver, or gold, or apparel. Yea, ye yourselves know, that these hands have ministered unto my necessities, and to them that were with me. I have showed you all things, how that so laboring ye ought to support the weak, and to remember the words of the Lord Jesus, how He said, It is more blessed to give than to receive.” Acts 20:18-35 . MH 154.2"
"And when they were come to him, he said unto them, Ye know, from the first day that I came into Asia, after what manner I have been with you at all seasons, Serving the Lord with all humility of mind, and with many tears, and temptations, which befell me by the lying in wait of the Jews: And how I kept back nothing that was profitable unto you, but have shewed you, and have taught you publickly, and from house to house, Testifying both to the Jews, and also to the Greeks, repentance toward God, and faith toward our Lord Jesus Christ. And now, behold, I go bound in the spirit unto Jerusalem, not knowing the things that shall befall me there: Save that the Holy Ghost witnesseth in every city, saying that bonds and afflictions abide me. But none of these things move me, neither count I my life dear unto myself, so that I might finish my course with joy, and the ministry, which I have received of the Lord Jesus, to testify the gospel of the grace of God. And now, behold, I know that ye all, among whom I have gone preaching the kingdom of God, shall see my face no more. Wherefore I take you to record this day, that I am pure from the blood of all men. For I have not shunned to declare unto you all the counsel of God. Take heed therefore unto yourselves, and to all the flock, over the which the Holy Ghost hath made you overseers, to feed the church of God, which he hath purchased with his own blood. For I know this, that after my departing shall grievous wolves enter in among you, not sparing the flock. Also of your own selves shall men arise, speaking perverse things, to draw away disciples after them. Therefore watch, and remember, that by the space of three years I ceased not to warn every one night and day with tears. And now, brethren, I commend you to God, and to the word of his grace, which is able to build you up, and to give you an inheritance among all them which are sanctified. I have coveted no man’s silver, or gold, or apparel. Yea, ye yourselves know, that these hands have ministered unto my necessities, and to them that were with me. I have shewed you all things, how that so labouring ye ought to support the weak, and to remember the words of the Lord Jesus, how he said, It is more blessed to give than to receive."
Ellen White directly references Acts 20:18-35 in this passage.
"Many today, if imbued with the same spirit of self-sacrifice, could do a good work in a similar way. Let two or more start out together in evangelistic work. Let them visit the people, praying, singing, teaching, explaining the Scriptures, and ministering to the sick. Some can sustain themselves as canvassers; others, like the apostle, can labor at some handicraft or in other lines of effort. As they move forward in their work, realizing their helplessness, but humbly depending upon God, they gain a blessed experience. The Lord Jesus goes before them, and among the wealthy and the poor they find favor and help. MH 154.3"
"After these things the Lord appointed other seventy also, and sent them two and two before his face into every city and place, whither he himself would come."
The EGW passage directly echoes the concept of sending out workers in pairs, as described in Luke 10:1. Both passages emphasize evangelistic work and reaching people in various locations.
"And when he had called unto him his twelve disciples, he gave them power against unclean spirits, to cast them out, and to heal all manner of sickness and all manner of disease."
Both passages discuss sending out disciples/workers to minister, heal, and teach. The EGW passage expands on the practical aspects of this work, echoing the spirit of Matthew 10:1 where Jesus gives his disciples power to heal and cast out demons.