"We are not to compromise principle by yielding to the opinions and prejudices which we may have encouraged before we united with God's commandment-keeping people. We have enlisted in the army of the Lord, and we are not to fight on the enemy's side, but on the side of Christ, where we can be a united whole, in sentiment, in action, in spirit, in fellowship. Those who are Christians indeed will be branches of the true vine, and will bear the same fruit as the vine. They will act in harmony, in Christian fellowship. They will not wear political badges, but the badge of Christ. GW 392.1"
"I am the vine, ye are the branches: He that abideth in me, and I in him, the same bringeth forth much fruit: for without me ye can do nothing."
EGW directly alludes to the vine and branches metaphor from John 15:5, emphasizing the importance of abiding in Christ and bearing fruit through unity and Christian fellowship.
"The word “fellowship” means participation, partnership. God employs the strongest figures to show that there should be no union between worldly parties and those who are seeking the righteousness of Christ. What communion can there be between light and darkness, truth and unrighteousness? None whatever. Light represents righteousness; darkness, unrighteousness. Christians have come out of darkness into the light. They have put on Christ, and they wear the badge of truth and obedience. They are governed by the elevated and holy principles which Christ expressed in His life.... GW 392.3"
"Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness?"
EGW directly quotes and expands upon the concept of fellowship between light and darkness from 2 Corinthians 6:14, emphasizing the separation between believers and the world.