'A shprakh iz a diyalekt mit an armey un a flot.' ('A language is (just) a dialect with an army and a navy') -- Max Wienreich (1945), p. 13 in Yivo-Bleter 25.1, in Yiddish.
See Clackson 2015: 13 and note 31: the phrase was given to Weinreich by a member of the audience at one of his lectures.
'If you find me in a garage, that does not prove that I am a mechanic or a car. Likewise, any form you find in an Aeolic text is not necessarily Aeolic.' -- Anon.