My hearing is not that great — unless someone says "Michael" or "Iowa." I can be in a loud crowd, but my name or the place where I grew up pierces through the noise.
This phenomenon is often called the cocktail party effect. Something like it can be helpful in discernment.
When we find ourselves regularly "hearing" something poke through the noise of our busy lives and stir our curiosity, it's time to pay attention.
In one of his many great essays, Paul Graham describes the importance of curiosity:
"There's a kind of excited curiosity that's both the engine and the rudder of great work. It will not only drive you, but if you let it have its way, will also show you what to work on."
Pay attention to what's on your curiosity "wavelength." What makes you excitedly curious is probably not going to fascinate me.
Such differences can direct our discernment.