[Thomas Hobbes] was 40 years old before he looked on geometry; which happened accidentally. Being in a gentleman’s library, Euclid’s *Elements* lay open, and “twas the 47 El. libri I” [Pythagoras’ Theorem]. He read the proposition . “By God,” sayd he, “this is impossible.” So he reads the demonstration of it, which referred him back to such a proposition; which proposition he read. That referred him back to another, which he also read. *Et sic deinceps*, that at last he was demonstratively convinced of that trueth. This made him in love with geometry.

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