In several of Seneca’s letters he speaks about the power of bloodletting as a medical practice. In one, he actually remarks—with some superiority—how earlier generations had not yet discovered bloodletting and suffered for it.

Marcus Aurelius hints at some other medical practices. He speaks of the treatment for ophthalmia—inflammation of the eye—and how doctors treated it with a bit of egg yolk. We also know that his doctor Galen gave Marcus opium for various pains and illnesses in old age.

Needless to say, none of these treatments are accepted or prescribed anymore. It’s interesting that the Stoics, who were so good at extrapolating out from the past, didn’t take a lesson from this—that so much of what we are certain about today will be disproven in the future. The point is (and it’s a point well made in Chuck Klosterman’s book But What If We’re Wrong?) that we should always be questioning the status quo—and majority opinion.

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