“Your light must shine before people in such a way that they may see your good works, and glorify your Father who is in heaven.”
Matthew 5:16
The New Testament uses various metaphors to describe the responsibilities of believers in Jesus. For example, Paul says that as good soldiers of Christ, we’re to endure suffering and to “please [our] commanding officer” (2 Timothy 2:3–5). As athletes, we undergo strict training to compete according to the rules (1 Corinthians 9:25).
In Matthew 5:13–16, Jesus used two everyday items—salt and a lamp—to illustrate the impact we can have on the society we live in. Salt is a preservative, a flavor enhancer, and a thirst stimulant. We’re to bring the salt of preservation and joy to a bland, tasteless, and otherwise decaying world.
A lamp gives light that enables people to see and to give direction. The lamp must necessarily be placed in a conspicuous position for the light to be effective. We’re to be the light of salvation to a world darkened by sin.
Note: excerpt from ODB