“Now I saw in my dream that… they drew near to a very miry slough that was in the midst of the plain; and they being heedless, did both fall suddenly into the bog. The name of the slough was “Despond.” Here, therefore, they wallowed for a time, being grievously bedaubed with the dirt… because of the burden that was on his back, began to sink in the mire.”
— John Bunyan, The Pilgrim’s Progress
The Slough of Despond is a nasty, miserable bog of guilt that sucks people in and is almost impossible to escape. In The Pilgrim’s Progress it’s an allegory for sin but I think it can be more accurately described as Depression. Yes, capital-D, clinically-diagnosable Depression.
Knowing someone stuck in the Slough of Despond can be difficult, draining, and generally lead to depression itself. I know this because I am scandalously intimate with the Slough. It’s my Unhappy Place. I’ve lived with it since I was 8 years old.