
John Locke is known for his philosophical work on the theory of empiricism, which holds that the source of knowledge is experience, as opposed to rationalism, which holds that the source of knowledge is reason. Locke's work on knowledge is primarily concerned with the question of how we can know the existence and nature of the world outside of our minds. He defines knowledge as the perception of the connexion of and agreement, or disagreement and repugnancy of any of our ideas. Locke identifies three types of knowledge: intuitive knowledge, demonstrative knowledge, and sensitive knowledge. He also distinguishes between knowledge, belief, and opinion, where knowledge is defined more strictly than the latter two. For Locke, intuitive knowledge is the most fundamental form of knowledge, serving as the foundation for all other genuine knowledge.
| Characteristics | Values |
|---|---|
| Source of human knowledge | Experience |
| Ideas | Innate or present in the mind at birth |
| Knowledge | Perception of the connection of ideas |
| Types of knowledge | Intuitive, demonstrative, and sensitive |
| Intuitive knowledge | Mind perceives the agreement or disagreement of ideas |
| Demonstrative knowledge | Certain universal knowledge |
| Sensitive knowledge | Less certain than intuitive or demonstrative knowledge |
| Nominal essence | Observable qualities used to classify a thing |
| Real essence | Internal constitution that makes a thing what it is |
| Primary qualities | Resemble ideas they cause in the mind |
| Secondary qualities | Configurations or arrangements of primary qualities |
| Knowledge of the external world | Statement expressing knowledge shared with a friend |
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Knowledge is perception of agreement or disagreement of ideas
John Locke, an empiricist philosopher, argued that the source of human knowledge is experience, in contrast to rationalist philosophers like Descartes, who believed that the source is reason. Locke's work in epistemology, particularly his book "An Essay Concerning Human Understanding", delves into the nature of knowledge and how we acquire it.
Locke defines knowledge as "the perception of the connexion of and agreement, or disagreement and repugnancy of any of our ideas." This definition encompasses three degrees of knowledge. The first degree, which Locke calls ""intuitive knowledge," involves the mind perceiving the agreement or disagreement of two ideas directly, without the need for any intervening concepts. For example, the mind intuitively knows that "white is not black" or "a circle is not a triangle."
The second degree of knowledge occurs when the mind perceives the agreement or disagreement of ideas indirectly, through the use of mediating ideas that help establish connections between other ideas. This can be seen in demonstrations or proofs, where a series of intermediate ideas are used to demonstrate the relationship between two concepts.
The third degree of knowledge, according to Locke, is sensitive knowledge, which is less certain than intuitive or demonstrative knowledge. It involves the perception of the particular existence of finite beings outside of ourselves, providing some evidence of the existence of mind-independent objects.
Locke's philosophy of science also plays a role in his conception of knowledge. He distinguishes between real and nominal essences, where the nominal essence consists of observable qualities used to classify a thing, and the real essence refers to the internal constitution that makes a thing what it is. This distinction is important for understanding his concept of substance, which is related to the idea of "something I know not what", supporting qualities that are not directly perceivable.
Furthermore, Locke rejects the notion that human knowledge is innately inscribed, arguing instead that knowledge is acquired through universal experiences or the universal possession of intellectual faculties. He also emphasizes the importance of abstract general ideas and classification in knowledge, as they help us make sense of the vast world of particulars.
In summary, for Locke, knowledge is indeed the perception of agreement or disagreement of ideas, and this perception involves both having the requisite ideas and perceiving the connections between them. His philosophy of knowledge extends beyond this basic definition, addressing issues related to perception, skepticism, and the external world.
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Intuitive knowledge
John Locke (1632-1704) is known for his work in epistemology, particularly his discussions on knowledge of the external world. Locke's philosophy is rooted in empiricism, which holds that the source of human knowledge is experience. He posits that the only things we perceive immediately are ideas, and that knowledge is distinct from mere probable opinion or belief.
Locke identifies three types of knowledge: intuitive, demonstrative, and sensitive. Intuitive knowledge, the focus of this discussion, is knowledge that is grasped immediately without the need for proof or explanation. It is the direct and immediate recognition of the agreement or disagreement of two ideas. For example, if one has ideas of the colours white and black, they can immediately know that white is not black. This type of knowledge is often associated with the meanings of words when they are explicitly defined. Locke also includes the knowledge of our own existence as intuitive, stating that "the mind is presently filled with the clear light of it".
Locke further distinguishes between knowledge and habitual knowledge. Actual knowledge occurs when we are actively perceiving the agreement in question, while habitual knowledge refers to our inclination to assent to what we have known in the past but are not currently focusing on. For instance, we may habitually know the multiplication tables even when our attention is elsewhere, provided we can recall the product of 8 and 7 when challenged.
In summary, Locke's concept of intuitive knowledge emphasizes the immediate and direct perception of the agreement or disagreement of ideas, without the need for external proof or explanation. It forms the basis of our understanding and serves as the foundation for all other forms of genuine knowledge.
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Knowledge is not innate
John Locke, an empiricist philosopher, argued that knowledge stems from experience, contrary to rationalist philosophers like Descartes, who believed that reason is the ultimate source of human knowledge. Locke rejected the rationalist notion that ideas are innate or present in the mind at birth, a hypothesis used to explain how humans acquire certain ideas like mathematical concepts and metaphysical principles.
Locke's philosophy emphasizes that knowledge is not innate but is acquired through experience and the perception of the connection between ideas. He defines knowledge as "the perception of the connexion of and agreement, or disagreement and repugnancy of any of our ideas." This definition outlines two fundamental criteria for acquiring knowledge: possessing the requisite ideas and perceiving the connection between them. According to Locke, knowledge is not innate because it requires the gradual acquisition of these ideas and the understanding of their relationships.
Locke categorizes knowledge into three types: intuitive knowledge, demonstrative knowledge, and sensitive knowledge. Intuitive knowledge is the most certain form, where the mind perceives the agreement or disagreement of ideas immediately and without intervention. Examples include analytic propositions such as "white is not black" or "a circle is not a triangle." Demonstrative knowledge involves perceiving the agreement or disagreement of ideas through mediating ideas, as seen in mathematical or moral relations. Sensitive knowledge is less certain and pertains to the existence of mind-independent objects.
Locke's philosophy of science further highlights his belief that knowledge is not innate. He distinguishes between real and nominal essences, arguing that the meaning of words comes from the complex of ideas we associate with them through experience, rather than their real essence or atomic constitution. This reflects a progressive reaction to the evolving scientific methodology of his time, where he recognized the importance of experimental methods and their fit with the Aristotelian ideal.
Locke also addresses the concept of knowledge of the external world, acknowledging the challenges posed by skepticism. He suggests that skepticism cannot be refuted, even if it may be mistaken, and that genuine skepticism may not be psychologically possible for humans. Locke's discussions around knowledge of the external world provide insight into his broader epistemology and theoretical philosophy, emphasizing the role of perception, representation, and the contents of thought.
In summary, Locke's philosophy asserts that knowledge is not innate but is acquired through experience and the perception of connections between ideas. His ideas on intuitive, demonstrative, and sensitive knowledge, as well as his understanding of essences and language, further reinforce his belief that knowledge is a dynamic and evolving construct.
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Knowledge of the external world
John Locke's discussions of knowledge of the external world are considered some of the most confusing and difficult passages of his entire body of philosophical work. Locke's approach to skepticism has been described as unfocused and possibly self-contradictory. Locke's philosophy is built around a strict distinction between knowledge and mere probable opinion or belief. However, his definition of knowledge appears to rule out the possibility of knowledge of the external world.
Locke, an empiricist, argued that the source of human knowledge is experience, as opposed to rationalist philosophers like Descartes, who claimed that the source is reason. Locke's epistemology is based on a representative theory of perception, according to which the only things we perceive immediately are ideas. This raises the question of how we can know the world beyond our ideas if we only perceive these ideas.
Locke identifies two main questions to ask about any kind of knowledge, including knowledge of the external world: "What do you know?" and "How do you acquire or achieve such knowledge?" Locke's concept of intuitive knowledge, or "certain universal knowledge," is the clearest and most perfectly certain degree of human knowledge. It serves as the foundation for all other genuine knowledge. This includes knowledge of identity and relation among clear ideas, such as "white is not black," "a circle is not a triangle," and "three are more than two."
Locke also acknowledges the existence of demonstrative knowledge, which is less certain than intuitive knowledge but more certain than mere belief or opinion. The most common area of demonstrative human knowledge is mathematics, where distinct ideas of particular quantities yield requisite clarity. Locke suggests that we may also possess demonstrative knowledge of moral relations if we carefully form abstract ideas of the mixed modes of human action.
Locke further introduces the concept of "sensitive knowledge," which is less certain than intuitive or demonstrative knowledge but still provides some evidence of the existence of particular objects outside ourselves. This type of knowledge pertains to the particular existence of finite beings and goes beyond bare probability.
Locke's philosophy of science is influenced by the new science's methodology and content. He is impressed by experimental methods and recognizes the importance of scientific knowledge. Locke's reaction to the evolving methodology of science is mostly progressive, but some view it as conservative, limiting his ability to adapt to new scientific advancements.
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Knowledge of primary and secondary qualities
John Locke, an empiricist philosopher, argued that the source of knowledge is experience, in contrast to rationalist philosophers like Descartes, who believed that the ultimate source of human knowledge is reason. Locke's work in epistemology, particularly his book *An Essay Concerning Human Understanding*, offers valuable insights into his ideas on knowledge, including his distinction between primary and secondary qualities.
Locke's concept of primary qualities refers to the intrinsic characteristics of an object that exist independently of our perception. These qualities include "solidity, extension, figure, motion, or rest, and number." Primary qualities are measurable, essential, and accessible through multiple senses. For instance, the solidity of a fire engine is a primary quality because it is an inherent feature of the object.
On the other hand, secondary qualities are configurations or arrangements of primary qualities that give rise to sensible ideas such as sounds, colours, odours, and tastes. Locke believed that secondary qualities are not inherent in the objects themselves but have the 'power' to produce these qualities in our minds when we perceive them. For example, the redness of a fire engine is not a quality present in the object but is a result of our perception.
Locke recognised that our knowledge of primary qualities is limited and obscure. While we may comprehend that all bodies possess determinable properties like shape, size, motion, and solidity, we often lack knowledge of the specific details of these properties and how they combine to create the secondary qualities we observe in the macroscopic world.
Locke's distinction between primary and secondary qualities contributes to his broader philosophical framework. He categorised knowledge into three types: intuitive knowledge, demonstrative knowledge, and sensitive knowledge. Intuitive knowledge involves direct perception of the agreement or disagreement between ideas, such as basic propositions or our own existence. Demonstrative knowledge involves perceiving the connection between ideas through mediating ideas or proofs. Sensitive knowledge, while less certain, pertains to the perception of the existence of finite beings and is considered more than just a probable claim.
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Frequently asked questions
Locke defines knowledge as "the perception of the connexion of and agreement, or disagreement and repugnancy of any of our ideas".
Locke identifies three types of knowledge: intuitive, demonstrative, and sensitive.
The two main questions to ask about any kind of knowledge are: "What do you know?" and "How do you acquire or achieve such knowledge?".
Unlike rationalist philosophers like Descartes, who argued that the source of human knowledge is reason, Locke, an empiricist, claimed that the source is experience.

























