Abstract
This article argues that Freud introduces the question of occultism in order to exclude the accident from the internal, psychical domain. The accident must be evacuated, for it is only by isolating a domain into which external randomness no longer penetrates that psychoanalysis gives itself a chance to be a science. And yet, as this article shows, the difference that makes all the difference when it comes to distinguishing science from superstition hinges on, and is determined by, chance — and a literary encounter.