But this must suffice in regard to the long-lived
castes and nations who are said to exist for a
very long period either on account of their soil and
climate, or of their diet, or of both. I can fittingly show
you that your good hopes are of easy attainment by
recounting that on every soil and in every clime men
who observe the proper exercise and the diet most
suitable for health have been long-lived.