Light
Matthew 5:15–16. Of the various possible uses of light, Jesus obviously has in mind the bringing of illumination through the revelation of God’s will for his people. Since Jesus is the Light of the world (John 8:12; 9:5), so also his followers should reflect that light. Like lights from a city illuminating the dark countryside or a lamp inside a house providing light for all within it, Christians must let their good works shine before the rest of the world so that others may praise God. The good works are most naturally seen as the “fruits in keeping with repentance” of 3:8. This verse does not contradict 6:1 because there the motive for good behavior in public is self-glorification rather than bringing glory to God.
Both metaphors of salt and light raise important questions about Christian involvement in society regarding all forms of separatism or withdrawal. We are not called to control secular power structures; neither are we promised that we can Christianize the legislation and values of the world. But we must remain active preservative agents, indeed irritants, in calling the world to heed God’s standards. We dare not form isolated Christian enclaves to which the world pays no attention.
Blomberg, Craig. Matthew. Vol. 22. Nashville: Broadman & Holman Publishers, 1992. Print. The New American Commentary.
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