Travelers at sea take soundings to measure the depth of the water through which they move. This kind of deep listening is necessary if they are to safely navigate treacherous waters. This is what we do as well, whenever we quiet ourselves and go to that inner place where there is enough silence for the words to resound.
Then there is the listening at the gates of the heart which has been closed for so long, and waiting for that mysterious inner voice to speak. When we hear it, we know it is the Truth to which we must now surrender our lives.