It is not likely that the history of psychology can be written in the next three centuries without mention of Freud's name and still claim to be a general history of psychology... Perhaps, had Freud been smothered in his cradle, the times would have produced a substitute, It is hard to say. The dynamics of history lack control experiments.
Cited in: Eric Shiraev (2010) A History of Psychology: A Global Perspective. p. 314 - A History of Experimental Psychology, 1929