 Hard on the heels of Boyle’s enlightenment, doubts about his faith began to trouble  him,[8]  and these “distracting Doubts of some of the Fundamentals of Christianity” continued: “never after did these fleeting Clouds, cease now &amp; then to darken … the clearest serenity of his quiet: which made him often say that Injections of this Nature were such a Disease to his Faith as the Tooth-ach is to the Body; for tho it be not mortall, ‘tis very troublesome” (BP 37:182r, Hunter 1994a, 17).