Full Idea
Nobody is on his guard against a disease that nobody has yet caught.
Gist of Idea
Nobody fears a disease which nobody has yet caught
Source
Aristotle (The Art of Rhetoric [c.350 BCE], 1372a27)
Book Reference
Aristotle: 'The Art of Rhetoric', ed/tr. Lawson-Tancred,H.C. [Penguin 1991], p.121
A Reaction
A beautifully simple indication of one problem with induction. In a dangerous situation, you can't wait around for a few experiences in order to learn the regularities and rules. Either you are doomed, or you must explain using related experiences.