..."Vilely low in spirits. I have written a page and a half, and doubt whether I can write more to-day. A quick throbbing at my heart, and fancies thronging on me. A disposition to sleep, or to think on things melancholy and horrible while I wake....
...I wrested myself so far out of the Slough of Despond as to take a good long walk, and my mind is restored to its elasticity..."
From Scott's Journal, October 24, 1827.
Good example of one benefit of exercise. Also the challenges of creative work, and the workings of the mind. The Slough of Despond is one of several phrases taken by Scott from John Bunyan's "Pilgrim's Progress".