In this paper, our point of departure is Plato’s Phaedrus-dialogue, in which the role and meaning of writing for memory are assessed, focusing special attention on Plato’s evaluation of writing. The use of writing-metaphors in elaborating the model of the psychic apparatus in a number of Freud’s texts is also discussed. Relying on Derrida’s interpretation (1967), the Project (1950c [1895]) is our starting point and the Note on the Wonder-block of 30 years later rounds off the discussion. Tracing Freud’s development, it becomes apparent that the model of the psychic apparatus gains support as the notion of facilitation is further elaborated based on the metaphor of writing or letter. The Platonic distinction between writing as supporting memory and writing as a “true writing in the soul” is encountered again in Freud’s work.