One of the first philosophers to use the term was Aristotle. However, the idea that the human intellect is “tabula rasa” at birth and that humans acquire knowledge later on through experience and learning belongs to the eleventh century Islamic philosopher known as Avicenna. In the seventeenth century, the philosopher John Locke reiterated that idea and added that the human mind evolves through perception and reflection. Sigmund Freud also subscribed to the idea of nurture during the end of the nineteenth century.