"Among the hundreds of quotes that [Alice] Calaprice notes are misattributed to Einstein are many that are subtly debatable. Some are edited or paraphrased to sharpen or neaten the original. 'Everything should be made as simple as possible, but no simpler' might, says Calaprice, be a compressed version of lines from a 1933 lecture by Einstein: 'It can scarcely be denied that the supreme goal of all theory is to make the irreducible basic elements as simple and as few as possible without having to surrender the adequate representation of a single datum of experience.'" From: https://www.nature.com/articles/d41586-018-05004-4