PART II.


39. Nothing is more free than the imagination of man; and though it
cannot exceed that original stock of ideas furnished by the internal and
external senses, it has unlimited power of mixing, compounding,
separating, and dividing these ideas, in all the varieties of fiction
and vision. It can feign a train of events, with all the appearance of
reality, ascribe to them a particular time and place, conceive them as
existent, and paint them out to itself with every circumstance, that
belongs to any historical fact, which it believes with the greatest
certainty. Wherein, therefore, consists the difference between such a
fiction and belief? It lies not merely in any peculiar idea, which is
annexed to such a conception as commands our assent, and which is
wanting to every known fiction. For as the mind has authority over all
its ideas, it could voluntarily annex this particular idea to any
fiction, and consequently be able to believe whatever it pleases;
contrary to what we find by daily experience. We can, in our conception,
join the head of a man to the body of a horse; but it is not in our
power to believe that such an animal has ever really existed.

It follows, therefore, that the difference between _fiction_ and
_belief_ lies in some sentiment or feeling, which is annexed to the
latter, not to the former, and which depends not on the will, nor can be
commanded at pleasure. It must be excited by nature, like all other
sentiments; and must arise from the particular situation, in which the
mind is placed at any particular juncture. Whenever any object is
presented to the memory or senses, it immediately, by the force of
custom, carries the imagination to conceive that object, which is
usually conjoined to it; and this conception is attended with a feeling