John Locke's Theory of Knowledge

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John Locke was an empiricist who believed that people could acquire

knowledge from experience. Ideas acted as raw materials and by knowing

the relation of the ideas, we got knowledge. All ideas are based on

experience but knowledge can also be justified by intuition and

demonstration. By sensation and reflection, we get sensitive,

intuitive and demonstrative knowledge with different degrees of

certainty and ways of evidence. In investigating the two main sources

of ideas of Locke, we then will explain the two kinds of knowledge

which based on reasoning by using suitable examples. The existence of

external objects by sensation will also be proved. At last, we will

introduce the dream arguments which challenge Locke certainty of

experience and explain how Locke rejected it.

Locke suggested sensation and reflection as two sources of ideas.

Sensation is a kind of external sense which is a process of external

objects convey into the mind and formed perceptions. Our sense come

across sensible objects and several distinct perceptions of the

objects convey into our mind through various sense organs. Thus, we

have ideas of hot, cold, black, white, soft and hard, which we call

them sensible qualities. This source of idea depends wholly upon our

senses and gives us sensitive knowledge. On the other hand, reflection

is the internal sense, which is operation of the perception of our own

mind. The soul comes to reflect and consider the ideas it receives

from sensation by operation. By perception, thinking, doubting,

reasoning, willing and all other different kinds of operations in our

mind, we can understand the incoming sensible ideas. By refle...

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... and pain. For

example, the pain I receive from hitting by Dr. Cheng in dream is

different from actually hitting by him. The pleasure and pain are as

great as happiness and misery that for certain is different from being

in dream. We review the experience in dreams in real life and for sure

it is unclear and gives us no pain.

To conclude, sensation and reflection gives us ideas, and by knowing

the relation of ideas, we have knowledge. Sensation is the foundation

of all other knowledge and by reasoning, we can have intuitive and

demonstrative knowledge. The consistence of experience and direct

perception of external object by sensation proved the existent of that

object. By acknowledging the difference of pain and pleasure received

from the real world and in dream, we can definitely realize we are in

dream of not.

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