Circumstantial evidence is a very tricky thing, answered Holmes thoughtfully. It may seem to point very straight to one thing, but if you shift your own point of view a little, you may find it pointing in an equally uncompromising manner to something entirely different.
ATTRIBUTION:
Sir Arthur Conan Doyle (18591930), British author. Sherlock Holmes, in The Boscombe Valley Mystery, The Adventures of Sherlock Holmes (1891).