Let us read what Fuller (1902) said about studying medical history:

The history maketh a young man to be old without either wrinkles or grey hair; privileging him with the experience of the age without either the infirmity or inconveniences thereof. Yeah, it not only maketh things past, present; but enableth one to make a rational conjecture of things to come. For this world affordeth no new accidents, but in the same sense wherein we call it a new moon, which is the old one in another shape; and yet no other than that hath been formerly. Old actions return again, furbished over with some new and different circumstances.2