The quantum theory gives me a feeling very much like yours. One really ought to be ashamed of its success, because it has been obtained with the Jesuit maxim: "Let not thy left hand know what thy right hand doeth."

The Born-Einstein Letters: Correspondence Between Albert Einstein, and Max and Hedwig Born from 1916 to 1955, Letter to Max Born, June 4, 1919 (p. 11), Walker & Company. 1971