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The Problems of Philosophy - Russell, Bertrand ยท 69 words
The Problems of Philosophy - Russell, Bertrand
Now what makes it natural to call this principle a law of thought is that it is by thought rather than by outward observation that we persuade ourselves of its necessary truth. When we have seen that a tree is a beech, we do not need to look again in order to ascertain whether it is also not a beech; thought alone makes us know that this is impossible.
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