There is some evidence that Spurgeon's bouts of depression arose from his many bodily afflictions as evidenced in his personal correspondence:
Jan 10, 1884 "I am altogether stranded. I am not able to leave my bed, or to find much rest upon it. The pains of rheumatism, lumbago and sciatica, mingled together, are exceedingly sharp. I am aware I am dwelling in a body capable of the most acute suffering."
Then, a letter to Susannah, "After the deadly chill of Thursday night at Nice, I feel gout coming on,,my left foot is badly swollen, and the knee joint is following suit. I have had very little sleep, and am very low......"
Just some samples of his thinking.
Cheers,
Jim