Still waters run deep

I'm looking for a quote that is basically the opposite of "still waters run deep." It seems I heard one once along the lines of "it's the babbling brook that makes the noise." Is anyone familiar with the quote about the babbling brook?

I'm not. But my question is -- what point are you trying to make with the phrase? There's:

It's the squeaky wheel that gets the grease. Meaning you have to make some noise to get a complaint addressed.

An empty wagon makes the most noise. (Or something like that.) Meaning that noise doesn't equal value or worth. At least that's what I think it means.