Female Figure (Sibyl with Tabula Rasa) by Diego Velázquez, ca. 1648

It is in my view a great mistake to suppose that the psyche of a new-born child is a tabula rasa in the sense that there is absolutely nothing in it. In so far as the child is born with a differentiated brain that is predetermined by heredity and therefore individualized, it meets sensory stimuli coming from outside not with any aptitudes, but with specific ones, and this necessarily results in a particular, individual choice and pattern of apperception. These aptitudes can be shown to be inherited instincts and preformed patterns, the latter being the a priori and formal conditions of apperception that are based on instinct. Their presence gives the world of the child and the dreamer its anthropomorphic stamp. They are the archetypes, which direct all fantasy activity into its appointed paths and in this way produce, in the fantasy-images of children’s dreams as well as in the delusions of schizophrenia, astonishing mythological parallels such as can also be found, though in lesser degree, in the dreams of normal persons and neurotics. It is not, therefore, a question of inherited ideas but of inherited possibilities of ideas.
“Concerning the Archetypes with Special Reference to the Anima Concept” (1936) In CW 9, Part I: The Archetypes and the Collective Unconscious. P. 136