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Russell says:
What is the difference between "knowledge" and "opinion"?
The man who has knowledge has knowledge of something,
that is to say,
of something that is exists,
for what does not exists is nothing.
(This is reminiscent of Parmenides . 我搜索 關於 Parmenides 有關此topic的資料:https://hume.ucdavis.edu/phi143/epiphys.htm )
Thus knowledge is infallible,
since it is logically impossible for it to be mistaken.
But opinion can be mistaken.
How can this be?
Opinion cannot be of what is not, for that is impossible;
non of what is, for that it would be knowledge.
Therefore opinion must be of what both is and is not.
But how is this possible?
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