He in fact is speaking to each and everyone of us. We are right there for all to see. We are all there to experience a new day a new message. Remember these words of Jesus are spoken to you, you are on the hillside. Jesus is talking to you.
Salt is a common commodity today and it is relatively in expensive.
Yet at the time of Jesus it was very costly. That name is said to have dated from ancient times when a roman solider could have been paid with salt. Salt in these times and having access to it was the difference between life and death. Salt was preservative, it kept food from spoiling. It added flavor and zest to that which otherwise was ordinary.