You are the salt of the earth and the light of the world: Isaiah 9, 1 Corinthians 2, 10, and Matthew 5.

# You are the light of the world. A city set on a hill cannot be hidden (Matthew 5:14)## I. The first reading: Isaiah 58:7-10Isaiah proclaims the conditions for the faithful’s light to shine: “Shall I not choose the hungry for my food, and the poor afflicted for my satisfaction?… Then shall your light break forth like the dawn, and your healing shall spring up speedily” (Is 58:7-8). The promise is clear: when we share our bread with the hungry, care for the needy, and clothe the naked, “then your light will rise like the dawn, and your healing will quickly appear” (v. 10). Isaiah connects this directly to Jesus’ teaching in the Sermon on the Mount, suggesting that acts of mercy are the condition for a disciple’s light to be seen. The disciple’s light does not come from solitary contemplation but from the concrete actions of love: sharing with the hungry, welcoming the stranger, and caring for the naked. The dawn promised by Isaiah is not a spiritual concept but the radiant glow emanating from a life of active love.## II. The second reading: 1 Corinthians 2:1-5Paul recalls to the Corinthians how he preached among them: “I did not come to you with persuasive words or wisdom” (1Cor 2:1). He explains, “My message and my preaching were not with persuasive speech or human wisdom” (v. 2). Paul was weak, afraid, and trembling when he spoke (v. 3), yet his message was from God’s Spirit and power (v. 4). His goal was that their faith would rest not on human reasoning but on the power of God (v. 5). Paul presents a paradox: weakness is the condition for authenticity. The Gospel light shines brighter when it is not competing with human constructs. Preaching that is poor in rhetoric but rich in the Spirit’s presence is the most effective.## III. The gospel: Matthew 5:13-16Jesus calls his disciples “the salt of the earth” and “the light of the world.” He says, “You are the salt of the earth; but if salt has lost its taste, how can its saltiness be restored? It is no longer good for anything, but is thrown out and trampled under foot” (Mt 5:13). Just as salt seasons and preserves food, so disciples are to season and preserve the world. And just as light illuminates darkness, so the disciple’s life is to shine in a dark world. “Let your light so shine before others that they may see your good works and give glory to your Father who is in heaven” (v. 16). Jesus emphasizes that the disciple’s light should not be hidden but displayed for all to see, leading others to glorify God.

Jesus continues His Mountain Address with two images defining the disciple’s identity. “You are the salt of the earth” (Mt 5:13): salt that loses its flavor is good for nothing but to be thrown out and trampled upon by men. “You are the light of the world” (v.14): a city set on a hill cannot be hidden. No one lights a lamp and puts it under a bushel, but on a stand, and it illuminates all in the house (v.15). “So let your light shine before others, that they may see your good works and glorify your Father who is in heaven” (v.16). The two images share a call to transcendence: salt exists to impart flavor to what lies outside, light exists to illuminate what surrounds it. A disciple who shuts himself away betrays his vocation. The purpose of good deeds is not self-affirmation but the glorification of the Father, precisely what 1Cor 2 expresses in terms of preaching: not human wisdom, but the power of God.

IV. Mary and the Dawn of Light

Is 58 promises that light will break forth like dawn for those who share bread and welcome the poor. The liturgical tradition sings Mary as “dawn,” preceding the Sun of Justice and announcing the day. This image is not merely poetic; it articulates Mary’s role in the economy of salvation. She is the creature who lived most fully what Is 58 describes: the Visitation is Mary’s rush to the mountains to serve Elizabeth, active and bodily sharing with the other in need. The song that resounds in Elizabeth’s house, the Magnificat, is the dawn shining before Jesus’ birth. 1Cor 2 describes Paul preaching in weakness, without human wisdom: Mary is the supreme model of this preaching through silence. The Gospels record few of her words—the ‘fiat,’ the Magnificat, “do whatever he tells you” (Jn 2:5). Her testimony is not rhetorical but ontological. She is the one who proclaims. Mt 5 says that a disciple’s light should shine so others may glorify the Father: Mary’s life is precisely this, a transparent existence leading those she meets to glorify God, not Mary. Like salt that dissolves in food imparting flavor unseen, Mary is the invisible seasoning of the Gospel.