By the way, Eliezer has already explicitly rejected a similar quote attributed to Einstein.

They're both of dubious authenticity anyway. (I searched around for this version too, and the earliest mention of it I could find was in a 1977 Reader's Digest, and that's only according to a citation in a 2006 book.) That has nothing to do with whether it's true, of course — if a vague maxim like this can count as a rationality quote at all, then that is independent of whether or not Einstein said it.