Similarly, when we talk of the mind being torn by doubt or worn by anxiety.

It would seem as though we tended mechanically to translate mental pleasures and pains into the language of bodily sensations.
The explanation of this deeply rooted tendency to a slightly illusory view of our mental states is, I think, an easy one.

For one thing, it follows from the relation of the mental image to the sense-impression that we should tend to assimilate the former to the latter as to its nature and origin.

This would account for the common habit of regarding thoughts, which are of course accompanied by representatives of their verbal symbols, as internal voices, a habit which is probably especially characteristic of the child and the uncivilized man, as we have found it to be characteristic of the insane.
Another reason, however, must be sought for the habit of assimilating internal feelings to external sensations.

If language has been evolved as an incident of social life, at once one of its effects and its causes, it would seem to follow that it must have first shaped Itself to the needs of expressing these common objective experiences which we receive by way of our senses.