Tabula rasa is about the epistemological idea that individuals are born without built-in mental content and that therefore all knowledge comes from experience or perception. Proponents of tabula rasa generally disagree with the doctrine of Innatism which holds that the mind is born already in possession of certain knowledge. Generally, proponents of the tabula rasa theory also favor the "nurture" side of the nature versus nurture debate when it comes to aspects of one's personality, social and emotional behavior, knowledge and sapience.