Light is better seen than heard
When Jesus used analogies to describe who we were, he often tells us that we are light. And thing about light is that it is seen, not heard.
In fact, of the only few times that scriptures use an analogy of sound to describe what the people of God can be like is in 1 Cor 13, where our lovelessness makes us like a “clanging symbol”. But other than, we are a visible specimen.
We are better seen than heard.
It is the way we radically live our lives which testifies to the gospel of Jesus. I’m not negating the importance of proclaiming the gospel. But without a life lived for the gospel, the message will mostly fall on deaf ears.