I think most of us know the various voices of our own imaginations and memories. Ask anyone who has lost someone or something dear to them: a child, a limb, a long cherished dream, a job, a career. Ask someone who blames themselves for a bad decision, usually made in a raw instant. Our memories have voices - often sad ones that clamor in the dark.
But keep walking, keep moving, keep leaving tracks. Wipe the blackboard clean. Leave the sadness behind, because the best part is we don't have to go alone! There is peace in the Son!