If you look through the ingredients list on just about any given recipe, you will find salt. I am not an experienced chef, but I know that any tasty dish that comes out of my kitchen contains at least a pinch of salt. But what does salt do? Make things salty? Salt is a nutrient source that can serve as a preservative or a flavor enhancer. It highlights the best parts of other foods.
“You are the salt of the earth, but if salt has lost its taste, how shall its saltiness be restored? It is no longer good for anything except to be thrown out and trampled under people’s feet.
Matthew 5:13, ESV
In the Sermon on the Mount, Jesus tells the crowds that they are the salt of the earth. There are a lot of ways to read into this. Salt at that time was more valuable than it is now, but it served the same purposes as a nutrient source or preservative or flavor enhancer. The main takeaway is that salt is good. Jesus is telling the people present (and us) that we have the power to enhance and preserve what God has created. When we live for Him, we are highlighting the best parts of His creation.