E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Alexander the Great went to consult the Delphic oracle before he started on his expedition against Persia. He chanced, however, to arrive on a day when no responses were made. Nothing daunted, he went in search of the Pythia, and when she refused to attend, took her to the temple by force. Son, said the priestess, thou art irresistible. Enough, cried Alexander; I accept your words as my response.