Summary
You Are: Salt and Light by Grace
In the Sermon on the Mount, Jesus gives His disciples two of the most striking metaphors in all of Scripture: "You are the salt of the earth" and "You are the light of the world" Matthew 5:13-16. These images are richly woven through the Bible. Salt purifies a spring in 2 Kings 2, is rubbed on a newborn in Ezekiel 16, seasons the holy incense in Exodus 30, and seals the covenant in Leviticus 2. In the ancient world salt was costly and precious, used to flavor, to purify, and to preserve. Light, likewise, fills the prophets and apostles: the servant given "as a light to the nations" Isaiah 49:6, Jesus declaring "I am the light of the world" John 8:12, and the God who shines in our hearts "to give the light of the knowledge of the glory of God in the face of Jesus Christ" 2 Corinthians 4:6.
It is tempting to hear these metaphors as a pep talk: Get out there and try harder. Be saltier. Shine brighter. The world needs it. But that misreads Jesus entirely. A pep talk cannot cure heart disease, and Scripture is unflinching about the heart. Luther insisted that every Christian must come to know the depth and breadth of personal sin—even, he said, to be terrified of it—because only then do we grasp our need for a Savior, and only then does grace taste truly sweet. Paul felt this acutely: "When I want to do what is good, evil lies close at hand… Wretched man that I am! Who will deliver me from this body of death?" Romans 7:21-24. Salt can be diluted by gypsum until it is worthless; our hearts, too, are infiltrated by the darkness of the world.
The crucial word, then, is the verb Jesus uses: not become, not try, but are. "You are the salt of the earth. You are the light of the world." This is a declaration before it is ever a calling. Christ has taken the darkness of our sin upon Himself at the cross, the debt is paid, and God says forgiven. Through the waters of Baptism, the light of Christ has taken up residence in us; through the Holy Spirit, He dwells within. We do not generate the light—we carry it because He is in us.
This is why Paul could write, "It is no longer I who live, but Christ who lives in me" Galatians 2:20. Where Christ lives, there is light. Where faith lives, there is the expression of faith. The salt of God's purifying and preserving work simply expresses itself through us; the good works Jesus speaks of in verse 16 are born of faith and flow outward as naturally as light from a lamp on its stand. We are seasoned by grace, and seasoned salt salts. Lit lamps shine.
So the call to "let your light shine before others" is not a command to manufacture brightness but an invitation to live as who we already are in Christ. The metaphor is not aspirational; it is baptismal. Shakespeare's Juliet may be the sun in her balcony scene, but that poetry pales beside the Author of these greater metaphors, who looks at sinners washed in His blood and declares them salt and light for the world. It is all His grace. You are. You are. "You Are" 9-11-22
Video citations
- "You Are" 9-11-22 — What you're open your Bibles please with me for our study this morning to Matthew the 5th chapter. If you're using a Pew edition of Holy Scripture, you'll find the 5th chapter of Matthew in the New…