All of our great traditions, religious, contemplative and artistic, say that you must a learn how to be alone - and have a relationship with silence. It is difficult, but it can start with just the tiniest quiet moment.
Lion sounds that have not grown from the mouse may exude naked power... but cannot convey any wisdom or understanding... The initial steps on the path to courageous speech then are the first tentative steps into the parts of us that cannot speak.
There are millions of people living Thoreau's life of quiet desperation, and they do not have the language to escape from that desperation.
To regret fully is to appreciate how high the stakes are in even the average human life; fully experienced, it turns our eyes, attentive and alert, to a future possibly lived better than our past.