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Why did John Locke reject the theory of innate ideas?
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Epistemology
The refraction (bending) of light as it passes from air into water causes an optical illusion: straws in the glass of water appear broken or bent at the water's surface.
In his Essay Concerning Human Understanding, John Locke rejected the doctrine of innate ideas by arguing that the human mind is initially a tabula rasa, or "white paper," void of all characters.12
Locke’s rejection was grounded in several key arguments:
- Requirement of Consciousness: Locke maintained that an idea cannot be considered "in the mind" unless one is conscious of it. He pointed out that infants and children show no evidence of possessing innate moral, logical, or mathematical truths, which contradicts the claim that these ideas are imprinted at creation.2
- Empirical Observation: He noted that travelers reported diverse cultures with vastly different moral and religious beliefs. If such ideas were innate, they would be universal; their absence or variation in different populations suggested they are acquired through experience rather than nature.2
- Genetic Origin: Locke shifted the focus of epistemology from self-evidence to the origin of ideas. He argued that all knowledge is derived from two sources: sensation (external experience) and reflection (internal awareness of mental operations).23
By replacing the theory of innate ideas with an empiricist account, Locke sought to clear away what he viewed as intellectual "rubbish" that hindered genuine understanding.2