"As co-laborers with Christ, with so favorable opportunities to impart the knowledge of God, our teachers should labor as if inspired from above. The hearts of the youth are not hardened; nor their ideas and opinions stereotyped, as are those of older persons. They may be won to Christ by your holy demeanor, your devotion, your Christ-like walk. It would be much better to crowd them less in the study of the sciences, and give them more time for religious privileges. Here a grave mistake has been made. CE 43.1"
"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 righteous living as a means of influencing others towards God. EGW's passage specifically applies this to teachers influencing youth, while Matthew 5:16 is a more general statement.
"We should ever look upon the youth as the purchase of the blood of Christ. As such they have demands upon our love, our patience, and our sympathy. If we would follow Jesus, we cannot restrict our interest and affection to ourselves and our own families; we cannot give our time and attention to temporal matters, and forget the eternal interests of those around us. I have been shown that it is the result of our selfishness that there are not one hundred young men, where now there is one, engaged in earnest labor for the salvation of their fellow-men. “Love one another as I have loved you,” is the command of Jesus. Look at his self-denial; behold what manner of love he has bestowed upon us; and then seek to imitate the Pattern.— “Testimony” No. 31, first published in 1882. CE 43.2"
"For ye are bought with a price: therefore glorify God in your body, and in your spirit, which are God’s."
Both passages directly connect the idea of being 'bought with a price' (Christ's sacrifice) with the obligation to live a life that reflects and glorifies God. EGW expands on this by applying it to our treatment of youth and our dedication to their salvation.