The meanest dog you’ll ever meet -
It ain’t the hound dog in the street
He bares his teeth and tears your skin
But brother, that’s the worst of him.
The dog you really got to dread
Is the one that howls inside your head
It's him whose howling drives men mad
And a mind to its undoing.
...
You got a lonesome road to walk
And it ain’t along the railroad track
And it ain’t along the black-top tar
You’ve walked a hundred times before.
I’ll tell you where the real road lies:
Between your ears, behind your eyes.
That is the path to Paradise,
Likewise, the road to ruin.
-- Wait For Me (reprise), Hadestown