“Imagination does not breed insanity. Exactly what does breed insanity is reason. Poets do not go mad; but chess-players do. Mathematicians go mad, and cashiers; but creative artists very seldom. I am not, as will be seen, in any sense attacking logic: I only say that this danger does lie in logic, not in imagination. Artistic paternity is as wholesome as physical paternity.
Moreover, it is worthy of remark that when a poet really was morbid it was commonly because he had some weak spot of rationality on his brain. Poe, for instance, really was morbid; not because he was poetical, but because he was specially analytical. Even chess was too poetical for him; he disliked chess because it was full of knights and castles, like a poem. He avowedly preferred the black discs of draughts, because they were more like the mere black dots on a diagram.
Perhaps the strongest case of all is this: that only one great English poet went mad, Cowper. And he was definitely driven mad by logic, by the ugly and alien logic of predestination. Poetry was not the disease, but the medicine; poetry partly kept him in health. He could sometimes forget the red and thirsty hell to which his hideous necessitarianism dragged him among the wide waters and the white flat lilies of the Ouse. He was damned by John Calvin; he was almost saved by John Gilpin” (G.K. Chesterton, Orthodoxy).
That’s just Chesterton showing that he would be shaking his God-hating fist just as much as most Calvinists would. See Unconditional Reprobation and Active Hardening: A Study on Romans 9:11-22 for sightings of fulminating Calvinist teapots, short and stout, shaking their handles, and emitting seditious steam from their spouts.
“So, then, to whom He desires, He shows mercy. And to whom He desires, He hardens. You will then say to me, Why does He yet find fault? For who has resisted His will? Yes, rather, O man, who are you answering against God? Shall the thing formed say to the One forming it, Why did You make me like this? Or does not the potter have authority over the clay, out of the one lump to make one vessel to honor, and one to dishonor? But if God, desiring to demonstrate His wrath, and to make His power known, endured in much long-suffering vessels of wrath having been fitted out for destruction, and that He make known the riches of His glory on vessels of mercy which He before prepared for glory, whom He also called, not only us, of Jews, but also out of nations” (Romans 9:18-24).