What is food without salt? Some of it is very tasteless.
Let me throw an aspect which I'm sure is not new to most of you.
First , a common fact. Salt makes you thirst. It makes you crave liquid. Simple.
We as disciples should, in our lives, cause people to thirst after the everlasting water of Christ. Our lives should not need to answer. Because the answer is Christ. We are a means to show others (together) what He looks like.
Like a mirror.
The "greatest" men and women in history have pointed to Christ as their strength.
If we as disciples lose our ability to point to Christ as our refuge and salvation..we become useless.