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洪小霞
We may say that all ideas, especially abstract ones, are naturally weak and vague; the human mind has no firm grasp of them; they are most easily confused with other similar ideas; and when we have used any term, it is easy to imagine that it has a definite idea attached to it, though it has no clear meaning. On the other hand, all impressions, that is, all feelings, both internal and external, are strong and active; Their boundaries are more precise and definite, and in this respect we are not liable to fall into the trap of error. Therefore, if we suppose, as is common, that a philosophical term used by people has no meaning or idea, we have only to ask, "From what impression does that hypothetical idea come?" If we can t find any impression, this confirms our conjecture. The subjection of ideas to such a clear view is one which we may reasonably hope will relieve men of all arguments concerning the nature and reality of ideas.