Korzybski's friend, Joshua Rosett wrote the following in a book published just before his death in 1940:
"Representation and symbolism, of which all animals make use for the speedy recognition of objects and conditions, is subject to unavoidable error. The human being, who makes the most extensive use of representation and of symbolism in spoken and written language, who employs comparisons and other figures of speech for the purpose of conveying certain meanings, is therefore most subject to an erroneous mental reproduction of objective experiences, in those states in which likeness is confused with identity and in which illusion becomes delusion."
—Joshua Rosett, M.D., The Mechanism of Thought, Imagery, And Hallucination (1939), pp. 264-265