"The assurance is broad and unlimited, and He is faithful who has promised. When we do not feel happy or comfortable, we are not to think God has forsaken us. We are to remember the words "Fear thou not; for I am with thee.""
"Fear thou not; for I am with thee: be not dismayed; for I am thy God: I will strengthen thee; yea, I will help thee; yea, I will uphold thee with the right hand of my righteousness."
Ellen White directly quotes Isaiah 41:10 and applies it to believers who feel abandoned, urging them to trust the promise rather than their feelings.
"regard their defects as incurable. God will give faith and grace to overcome them. GC 489.2"
"And he said unto me, My grace is sufficient for thee: for my strength is made perfect in weakness. Most gladly therefore will I rather glory in my infirmities, that the power of Christ may rest upon me."
Both passages address the idea of overcoming personal weaknesses through God's grace. While not a direct quote, the concept is clearly echoed.
We are now living in the great day of atonement. In the typical service, while the high priest was making the atonement for Israel, all were required to afflict their souls by repentance of sin and humiliation before the Lord, lest they be cut off from among the people. In like manner, all who would have their names retained in the book of life should now, in the few remaining days of their probation, afflict their souls before God by sorrow for sin and true repentance. There must be deep, faithful searching of heart. The light, frivolous spirit indulged by so many professed Christians must be put away. There is earnest warfare before all who would subdue the evil tendencies that strive for the mastery. The work of preparation is an individual work. We are not saved in groups. The purity and devotion of one will not offset the want of these qualities in another. Though all nations are to pass in judgment before God, yet He will examine the case of each individual with as close and sear…
"Also on the tenth day of this seventh month there shall be a day of atonement: it shall be an holy convocation unto you; and ye shall afflict your souls, and offer an offering made by fire unto the Lord."
The EGW passage directly interprets and applies the principle of afflicting one's soul from Leviticus 23:27 to the present time, connecting it to the day of atonement and the need for repentance.