Jesus’ teachings in the Sermon on the Mount in Matthew 5 leave us with numerous questions to ask ourselves. One of the most important ones we need to wrestle with as Christians is: what kind of difference are you making in the world around you?
The difference shouldn’t be in a vague, motivational sense, but a real and tangible daily experience of those around us. Are the people in your home, your workplace, and your circle of friends different because you are in their lives? Is your presence changing anything? Is God’s presence within you being poured out to people through your life?
Jesus presents a foundational concept for the Kingdom of God. In Jesus, we are given an identity that cannot be shaken or exchanged because it is secured by his life, death, and resurrection. Any influence we have should flow from this truth. Our identity comes first and the influence follows.
But what does that actually mean for how we live?
A World That Needs Both
Salt, in the ancient world, was primarily used for preservation. It kept meat from rotting and decaying. When Jesus calls his followers the salt of the earth, he is making an implicit statement about the earth itself: it is decaying. Without preservation, without something to hold back the rot, the world moves in one natural direction.
Similarly, when Jesus calls his followers the light of the world, he is acknowledging that the world is full of darkness. Darkness is the absence of light, and it doesn’t take a large amount of illumination for a difference to be made.
These are not comfortable descriptions of our world, but they are honest ones. And rather than leaving his followers overwhelmed by that reality, Jesus responds to it by telling them who they are and what they carry.
What Salt Does
Salt has served multiple purposes throughout history and each one carries a meaningful parallel for how followers of Christ are called to live.
As described above, salt preserves. It creates an environment where decay cannot take hold. For those who follow Christ, this raises a pointed question: are we getting close enough to the people around us to actually make a difference in their lives? Preservation requires contact. Salt sitting in a shaker does nothing for the meat on the table, it must be submerged. In the same way, faith that stays safely contained within the walls of a church building, never engaging in the messiness of real relationships, cannot do the work it was designed to do.
Salt seasons. Interestingly, salt does not simply add flavor. It suppresses bitterness, which allows sweetness to come forward. In other words, salt blocks the bad so the good can be experienced. Are the people around us living sweeter lives because of our presence, or more bitter ones?
Salt heals. Roman soldiers soaked in salt baths to ease pain and packed wounds with salt to stop bleeding and prevent infection. The people in your life who are carrying wounds, whether physical, emotional, or spiritual, need to know they can come to you and find something that eases the pain rather than adding to it.
Salt has value. The Roman word for salary comes from the Latin word for salt, because soldiers were sometimes paid with it. Salt was currency. It was worth something. The question worth asking is whether the people around us see our presence as an asset in their lives or a liability. In Jesus calling us the “salt of the earth,” He was also giving us a deeper piece of our identity in Him. We are the valuable to God and worth the price of Jesus’ life.
The Warning About Saltiness
Jesus does not only celebrate what salt does. He issues a warning. If salt loses its saltiness, he says in Matthew 5:13, it is no longer good for anything except to be thrown out and trampled underfoot.
In the ancient world, salt was not refined the way it is today. It was harvested from places like the Dead Sea and came packed with impurities. When that crude salt was exposed to moisture, the sodium chloride, the actual salt, dissolved away first. What remained still looked like a pile of salt. But it had lost all its power.
This is a sobering picture. It is possible to look like a follower of Christ while having lost the very thing that made that identity meaningful. When believers allow themselves to be so shaped by the values, habits, and priorities of the surrounding culture that there is no longer any distinction, the salt is gone. The pile may still look the same from the outside, but the preserving, seasoning, healing power has dissolved away.
What Light Does
The second image Jesus uses is light, and he is specific about the relationship between the lamp and the light. He focuses not on the light itself but on the lamp that carries it. The lamp is the vessel. The light is what it holds.
Followers of Christ are the lamps. He is the light. The Holy Spirit is the oil. The image is one of carrying something that does not originate with us but that we are responsible to hold up and not hide.
Jesus makes three observations about light in this passage. A city on a hill cannot be hidden. You would never light a lamp and put it under a basket. And the lampstand matters.
That last point deserves particular attention. The lampstand is what holds the lamp up and allows the light to reach as far as possible. Every person has lampstands in their life: a home, a workplace, a neighborhood, a circle of friends, a platform built through years of skill or service. These are not accidents, they are placements. They are the specific places where a person’s light is meant to shine.
The Result of Salt and Light
In Matthew 5:16, Jesus explains what happens when his followers live this way. People see the good works and they give glory to God. Not glory to the person doing the works, but glory to the Father.
This is the goal. Not recognition or influence for its own sake. But lives lived in such a way that the people watching are drawn not to admire the lamp but to wonder about the light inside it.
Three things make this possible in practice: a clear sense of purpose, an awareness of the lampstands God has placed in your life, and the persistence to keep showing up as salt and light even when the results are not immediately visible.
The world is decaying. It is full of darkness. And you have been placed in it, in your specific home, your specific job, your specific community, as salt and as light. The only question remaining is whether you are living like it.