Jean Cocteau? Apocryphal?
Quote Investigator: Jean Cocteau’s work “Opium: The Diary of a Cure” was based on a set of notes he wrote in 1929 with significant additions made in 1930. A translation from the French to English by Margaret Crosland and Sinclair Road appeared in 1957. Cocteau wrote the following about opium’s power, Boldface added to excerpt by QI:[ref] 1957, Opium: The Diary of a Cure by Jean Cocteau, Translated from the French by Margaret Crosland and Sinclair Road, Quote Page 93, Peter Owen Limited, London. (Verified with hardcopy) [/ref]
It is difficult to live without opium after having known it because it is difficult, after knowing opium, to take earth seriously. And unless one is a saint, it is difficult to live without taking earth seriously.
Image Notes: Picture of a field of poppies from Schwoaze at Pixabay. Image has been cropped and resized.
(Great thanks to the anonymous person whose inquiry led QI to formulate this question and perform this exploration.)