"***** Chapter 17—Separation From the World Dear Brethren and Sisters, God designed that the light of the church should increase and grow brighter and brighter unto the perfect day. Precious promises are made to God's people upon condition of obedience. If, like Caleb and Joshua, you had wholly followed the Lord, He would have magnified His power in your midst. Sinners would have been converted, and backsliders reclaimed, by your influence; and even the enemies of our faith, although they might oppose and speak against the truth, could but admit that God was with you. 2T 124"
"Let your light so shine before men, that they may see your good works, and glorify your Father which is in heaven."
Both passages discuss the importance of believers being a light to the world through their actions and obedience.