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5. Natural causes of their imperfection, especially in those that stand for mixed modes, and for our ideas of substances.
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
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5. Natural causes of their imperfection, especially in those that stand for mixed modes, and for our ideas of substances.

Words having naturally no signification, the idea which each stands for must be learned and retained, by those who would exchange thoughts, and hold intelligible discourse with others, in any language. But this is the hardest to be done where,

First, The ideas they stand for are very complex, and made up of a great number of ideas put together.

Secondly, Where the ideas they stand for have no certain connexion in nature; and so no settled standard anywhere in nature existing, to rectify and adjust them by.

Thirdly, When the signification of the word is referred to a standard, which standard is not easy to be known.

Fourthly, Where the signification of the word and the real essence of the thing are not exactly the same.

These are difficulties that attend the signification of several words that are intelligible. Those which are not intelligible at all, such as names standing for any simple ideas which another has not organs or faculties to attain; as the names of colours to a blind man, or sounds to a deaf man, need not here be mentioned.

In all these cases we shall find an imperfection in words; which I shall more at large explain, in their particular application to our several sorts of ideas: for if we examine them, we shall find that the names of Mixed Modes are most liable to doubtfulness and imperfection, for the two first of these reasons; and the names of Substances chiefly for the two latter.