"What the eyes perceive in herbs or stones or trees is not yet a remedy; the eyes see only the dross."

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If my efforts have led to greater success than usual, this is due, I believe, to the fact that during my wanderings in the field of medicine, I have strayed onto paths where the gold was still lying by the wayside. It takes a little luck to be able to distinguish gold from dross, but that is all.

— Robert Koch