We can understand the respective roles of praxeology and ethics by means of the analogy of a physician treating a patient. The physician must understand two things:

1. how the patient is actually functioning—for example, how that person may be reacting to invasive viruses; and

2. how the patient is supposed to function in a state of optimal health.

If the physician does not have a diagnosis or does not know what constitutes good health, then he or she will be unlikely to cure any illness or to nurture the patient to health.     

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