"Strength in Prayer Daily beset by temptation, constantly opposed by the leaders of the people, Christ knew that He must strengthen His humanity by prayer. In order to be a blessing to men, He must commune with God, pleading for energy, perseverance, and steadfastness. Thus He showed His disciples where His strength lay. Without this daily communion with God, no human being can gain power for service. Christ alone can direct the thoughts aright. He alone can give noble aspirations and fashion the character after the divine similitude. If we draw near to Him in earnest prayer, He will fill our hearts with high and holy purposes, and with deep longings for purity and righteousness. The dangers thickening around us demand from those who have an experience in the things of God, a watchful supervision. Those who walk humbly before God, distrustful of their own wisdom, will realize their danger and will know God's keeping care. CT 323"
"And it came to pass in those days, that he went out into a mountain to pray, and continued all night in prayer to God."
Both passages emphasize the importance of prayer for strength and guidance, particularly in the context of Christ's example. While EGW doesn't explicitly quote Luke 6:12, the theme of Christ seeking strength through prayer is central to both.
"The followers of Christ are to be separate from the world in principles and interests, but they are not to isolate themselves from the world. The Saviour mingled constantly with men, not to encourage them in anything that was not in accordance with God's will, but to uplift and ennoble them. “I sanctify Myself,” He declared, “that they also might be sanctified.” John 17:19 . So the Christian is to abide among men, that the savor of divine love may be as salt to preserve the world from corruption. CT 323.1"
"And for their sakes I sanctify myself, that they also might be sanctified through the truth."
EGW directly quotes John 17:19.
"Ye are the salt of the earth: but if the salt have lost his savour, wherewith shall it be salted? it is thenceforth good for nothing, but to be cast out, and to be trodden under foot of men."
EGW directly uses the 'salt of the earth' concept and applies it to Christians preserving the world from corruption, which is a clear and intentional reference to Matthew 5:13.