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There is no such thing as an incurable illness in reality—for what the doctors call such is only an illness for which they have not yet been able to discover a physical remedy. <ref>http://incarnateword.in/cwsa/31/specific-illnesses-ailments-and-other-physical-problems#p1</ref>

But, each man can make his own experiment. If one has a bad throat, this may be due to the fact that the day before one was in a state of depression. Or perhaps one is very unhappy, dissatisfied, one finds everything very bad, and the next day one gets a cold in the head.... Everyone must make his own observations. <ref>https://incarnateword.in/cwm/04/31-march-1951#p4</ref>