Commentary: A thesis that still warrants defence and promotion

said he; ‘‘they are well enough trained.’’ ‘‘Well,’’ I replied, ‘‘you have been teaching students at least for twenty-five years?’’ ‘‘Yes,’’ said he. Then I asked him: ‘‘Can you tell me the symptoms of which the majority of people complain when they fall sick?’’ After some consideration he said, ‘‘No.’’ I said, ‘‘The most common complaint is exhaustion. Can you tell me what is exhaustion?’’ He again, after a little consideration, said ‘‘No.’’ ‘‘So,’’ I said, ‘‘here is a symptom of the most common kind, a symptom which, when understood, throws a flood of light upon the patient’s state, and yet you, who reckon to be able