“You are the salt of the earth. But if the salt loses its saltiness, how can it be made salty again? It is no longer good for anything, except to be thrown out and trampled underfoot.
“You are the light of the world. A town built on a hill cannot be hidden. Neither do people light a lamp and put it under a bowl. Instead they put it on its stand, and it gives light to everyone in the house. In the same way, let your light shine before others, that they may see your good deeds and glorify your Father in heaven.
In context these words apply to disciples of Jesus, those who are following him. The key here is not some kind of spiritual experience, but simply the needed commitment and follow through.
What Jesus is referring to here is a different kind of people. Marked, indeed changed by their identity with and in him. They used to be called “Jesus people,” “people of the Book” secondary to that. This impacts everything. How they read the Bible. How they live from day to day in their families, and in their places of work. How they spend their time, their money. How they see the world and live in it. Recognized by their good works.
This is the people who alone are the “city* on a hill,” “the salt” and “light” that the world needs. All because of Jesus. But participants in this. In and through him.