Tabula rasa (; "blank slate") is the theory that individuals are born without built-in mental content, and therefore all knowledge comes from experience or perception. Epistemological proponents of tabula rasa disagree with the doctrine of innatism, which holds that the mind is born already in possession of certain knowledge. Proponents of the tabula rasa theory also favour the "nurture" side of the nature versus nurture debate when it comes to aspects of one's personality, social and emotional behaviour, knowledge, and sapience. Etymology Tabula rasa is a Latin phrase often translated as clean slate in English and originates from the Roman tabula, a wax-covered tablet used for notes, which was blanked (rasa) by heating the wax and then smoothing it. This roughly equates to the English term "blank slate" (or, more literally, "erased slate") which refers to the emptiness of a slate prior to it being written on with chalk. Both may be renewed repeatedly, by melting the wax of the tablet or by erasing the chalk on the slate. Philosophy Ancient Greek philosophy In Western philosophy, the concept of tabula rasa can be traced back to the writings of Aristotle who writes in his treatise De Anima () of the "unscribed tablet." In one of the more well-known passages of this treatise, he writes that: Haven't we already disposed of the difficulty about interaction involving a common element, when we said that mind is in a sense potentially whatever is thinkable, though actually it is nothing until it has thought? What it thinks must be in it just as characters may be said to be on a writing tablet on which as yet nothing stands written: this is exactly what happens with mind. This idea was further evolved in Ancient Greek philosophy by the Stoic school. Stoic epistemology emphasizes that the mind starts blank, but acquires knowledge as the outside world is impressed upon it. The doxographer Aetius summarizes this view as "When a man is born, the Stoics say, he has the commanding part of his soul like a sheet of paper ready for writing upon." Diogenes Laërtius attributes a similar belief to the Stoic Zeno of Citium when he writes in Lives and Opinions of Eminent Philosophers that: Perception, again, is an impression produced on the mind, its name being appropriately borrowed from impressions on wax made by a seal; and perception they divide into, comprehensible and incomprehensible: