"Little differences dwelt upon lead to actions that destroy Christian fellowship. Let us not allow the enemy thus to gain the advantage over us. Let us keep drawing nearer to God and to one another. Then we shall be as trees of righteousness, planted by the Lord, and watered by the river of life. And how fruitful we shall be! Did not Christ say: “Herein is My Father glorified, that ye bear much fruit”? John 15:8 . 8T 243.1"
"Herein is my Father glorified, that ye bear much fruit; so shall ye be my disciples."
Ellen White directly references John 15:8 in this passage.