"***** The light that the Lord has given on this subject in His word is plain, and men will be tested and tried in many ways to see if they will heed it. Every church, every family, needs to be instructed in regard to Christian temperance. All should know how to eat and drink in order to preserve health. We are amid the closing scenes of this world's history; and there should be harmonious action in the ranks of Sabbath-keepers. Those who stand aloof from the great work of instructing the people upon this question, do not follow where the Great Physician leads the way.... GW 232.1"
"Whether therefore ye eat, or drink, or whatsoever ye do, do all to the glory of God."
The EGW passage directly applies the principle of doing all things to the glory of God, specifically in the context of eating and drinking to preserve health, which aligns with Christian temperance.
"principles of true health reform. Christianity is to be brought into the practical life. Earnest, thorough reformatory work is to be done. True Bible religion is an outflowing of the love of God for fallen man. God's people are to advance in straightforward lines to impress the hearts of those who are seeking for truth, who desire to act their part aright in this intensely earnest age. We are to present the principles of health reform before the people, doing all in our power to lead men and women to see the necessity of these principles, and to practice them.— Testimonies for the Church 6:376-379 . GW 232.2"
"Let your light so shine before men, that they may see your good works, and glorify your Father which is in heaven."
Both passages emphasize the importance of living out one's faith in a way that is visible and impactful to others. EGW connects this to health reform, while Matthew 5:16 speaks more generally about good works.