The writer claimed by a momentary expression, a twitch of a muscle or a
glance of an eye, to fathom a man's inmost thoughts. Deceit, according
to him, was an impossibility in the case of one trained to observation
and analysis. His conclusions were as infallible as so many propositions
of Euclid. So startling would his results appear to the uninitiated that
until they learned the processes by which he had arrived at them they
might well consider him as a necromancer.
-- Arthur Conan Doyle.
A Study In Scarlet Chapter II. "The Science Of Deduction"
[quoting from "The Book of Life" by Sherlock Holmes].